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Co-Authors

This is a "connection" page, showing publications co-authored by Mark Friedberg and Luc Mertens.

 
Connection Strength
 
 
 
12.811
 
  1. Friedberg MK, Mertens L. Echocardiographic assessment of ventricular synchrony in congenital and acquired heart disease in children. Echocardiography. 2013 Apr; 30(4):460-71.
    View in: PubMed
    Score: 0.595
  2. Mertens L, Friedberg MK. Echocardiography and cardiac resynchronization therapy in children and patients with congenital heart disease. Minerva Pediatr. 2012 Oct; 64(5):451-60.
    View in: PubMed
    Score: 0.575
  3. Friedberg MK, Mertens L. Deformation imaging in selected congenital heart disease: is it evolving to clinical use? J Am Soc Echocardiogr. 2012 Sep; 25(9):919-31.
    View in: PubMed
    Score: 0.565
  4. Mertens LL, Friedberg MK. Imaging the right ventricle--current state of the art. Nat Rev Cardiol. 2010 Oct; 7(10):551-63.
    View in: PubMed
    Score: 0.495
  5. Friedberg MK, Mertens L. Tissue velocities, strain, and strain rate for echocardiographic assessment of ventricular function in congenital heart disease. Eur J Echocardiogr. 2009 Jul; 10(5):585-93.
    View in: PubMed
    Score: 0.453
  6. Mertens L, Friedberg MK. Selecting pacing sites in children with complete heart block: is it time to avoid the right ventricular free wall? Eur Heart J. 2009 May; 30(9):1033-4.
    View in: PubMed
    Score: 0.451
  7. Mertens L, Friedberg MK. The gold standard for noninvasive imaging in congenital heart disease: echocardiography. Curr Opin Cardiol. 2009 Mar; 24(2):119-24.
    View in: PubMed
    Score: 0.448
  8. Hui W, Slorach C, Iori S, Dragulescu A, Mertens L, Friedberg MK. The right ventricular myocardial systolic-to-diastolic duration ratio in children after surgical repair of Tetralogy of Fallot. J Appl Physiol (1985). 2020 Jun 01; 128(6):1677-1683.
    View in: PubMed
    Score: 0.244
  9. Slieker MG, Fackoury C, Slorach C, Hui W, Friedberg MK, Fan CS, Manlhiot C, Dillenburg R, Kantor P, Mital S, Liu P, Nathan PC, Mertens L. Echocardiographic Assessment of Cardiac Function in Pediatric Survivors of Anthracycline-Treated Childhood Cancer. Circ Cardiovasc Imaging. 2019 12; 12(12):e008869.
    View in: PubMed
    Score: 0.237
  10. Di Maria MV, Campbell KR, Burkett DA, Younoszai AK, Landeck BF, Mertens L, Ivy DD, Hunter KS, Friedberg MK. Parameters of Right Ventricular Function Reveal Ventricular-Vascular Mismatch as Determined by Right Ventricular Stroke Work versus Pulmonary Vascular Resistance in Children with Pulmonary Hypertension. J Am Soc Echocardiogr. 2020 02; 33(2):218-225.
    View in: PubMed
    Score: 0.236
  11. Villemain O, Baranger J, Friedberg MK, Papadacci C, Dizeux A, Messas E, Tanter M, Pernot M, Mertens L. Ultrafast Ultrasound Imaging in Pediatric and Adult Cardiology: Techniques, Applications, and Perspectives. JACC Cardiovasc Imaging. 2020 Aug; 13(8):1771-1791.
    View in: PubMed
    Score: 0.235
  12. Rösner A, Bharucha T, James A, Mertens L, Friedberg MK. Impact of Right Ventricular Geometry and Left Ventricular Hypertrophy on Right Ventricular Mechanics and Clinical Outcomes in Hypoplastic Left Heart Syndrome. J Am Soc Echocardiogr. 2019 10; 32(10):1350-1358.
    View in: PubMed
    Score: 0.230
  13. Akazawa Y, Fujioka T, Kühn A, Hui W, Slorach C, Roehlig C, Mertens L, Vogt M, Friedberg MK. Right Ventricular Diastolic Function and Right Atrial Function and Their Relation With Exercise Capacity in Ebstein Anomaly. Can J Cardiol. 2019 Dec; 35(12):1824-1833.
    View in: PubMed
    Score: 0.228
  14. Larios G, Yim D, Dragulescu A, Mertens L, Grosse-Wortmann L, Friedberg MK. Right ventricular function in patients with pulmonary regurgitation with versus without tetralogy of Fallot. Am Heart J. 2019 07; 213:8-17.
    View in: PubMed
    Score: 0.226
  15. Pieles GE, Grosse-Wortmann L, Hader M, Fatah M, Chungsomprasong P, Slorach C, Hui W, Fan CS, Manlhiot C, Mertens L, Hamilton R, Friedberg MK. Association of Echocardiographic Parameters of Right Ventricular Remodeling and Myocardial Performance With Modified Task Force Criteria in Adolescents With Arrhythmogenic Right Ventricular Cardiomyopathy. Circ Cardiovasc Imaging. 2019 04; 12(4):e007693.
    View in: PubMed
    Score: 0.225
  16. Lumens J, Fan CS, Walmsley J, Yim D, Manlhiot C, Dragulescu A, Grosse-Wortmann L, Mertens L, Prinzen FW, Delhaas T, Friedberg MK. Relative Impact of Right Ventricular Electromechanical Dyssynchrony Versus Pulmonary Regurgitation on Right Ventricular Dysfunction and Exercise Intolerance in Patients After Repair of Tetralogy of Fallot. J Am Heart Assoc. 2019 01 22; 8(2):e010903.
    View in: PubMed
    Score: 0.222
  17. Fujioka T, Kühn A, Sanchez-Martinez S, Bijnens BH, Hui W, Slorach C, Roehlig C, Mertens L, Vogt M, Friedberg MK. Impact of Interventricular Interactions on Left Ventricular Function, Stroke Volume, and Exercise Capacity in Children and Adults With Ebstein's Anomaly. JACC Cardiovasc Imaging. 2019 May; 12(5):925-927.
    View in: PubMed
    Score: 0.221
  18. Grotenhuis HB, Dallaire F, Verpalen IM, van den Akker MJE, Mertens L, Friedberg MK. Aortic Root Dilatation and Aortic-Related Complications in Children After Tetralogy of Fallot Repair. Circ Cardiovasc Imaging. 2018 12; 11(12):e007611.
    View in: PubMed
    Score: 0.220
  19. Yim D, Hui W, Larios G, Dragulescu A, Grosse-Wortmann L, Bijnens B, Mertens L, Friedberg MK. Quantification of Right Ventricular Electromechanical Dyssynchrony in Relation to Right Ventricular Function and Clinical Outcomes in Children with Repaired Tetralogy of Fallot. J Am Soc Echocardiogr. 2018 07; 31(7):822-830.
    View in: PubMed
    Score: 0.214
  20. Son JS, James A, Fan CS, Mertens L, McCrindle BW, Manlhiot C, Friedberg MK. Prognostic Value of Serial Echocardiography in Hypoplastic Left Heart Syndrome. Circ Cardiovasc Imaging. 2018 07; 11(7):e006983.
    View in: PubMed
    Score: 0.214
  21. Cifra B, Morgan CT, Dragulescu A, Guerra VC, Slorach C, Friedberg MK, Manlhiot C, McCrindle BW, Dipchand AI, Mertens L. Right ventricular function during exercise in children after heart transplantation. Eur Heart J Cardiovasc Imaging. 2018 06 01; 19(6):647-653.
    View in: PubMed
    Score: 0.213
  22. Cifra B, Chen CK, Fan CS, Slorach C, Manlhiot C, McCrindle BW, Dragulescu A, Redington AN, Friedberg MK, Nathan PC, Mertens L. Dynamic Myocardial Response to Exercise in Childhood Cancer Survivors Treated with Anthracyclines. J Am Soc Echocardiogr. 2018 08; 31(8):933-942.
    View in: PubMed
    Score: 0.210
  23. Driessen MMP, Meijboom FJ, Hui W, Dragulescu A, Mertens L, Friedberg MK. Regional right ventricular remodeling and function in children with idiopathic pulmonary arterial hypertension vs those with pulmonary valve stenosis: Insights into mechanics of right ventricular dysfunction. Echocardiography. 2017 Jun; 34(6):888-897.
    View in: PubMed
    Score: 0.196
  24. Chowdhury SM, Goudar SP, Baker GH, Taylor CL, Shirali GS, Friedberg MK, Dragulescu A, Chessa KS, Mertens L. Speckle-Tracking Echocardiographic Measures of Right Ventricular Diastolic Function Correlate with Reference Standard Measures Before and After Preload Alteration in Children. Pediatr Cardiol. 2017 Jan; 38(1):27-35.
    View in: PubMed
    Score: 0.189
  25. Burkett DA, Slorach C, Patel SS, Redington AN, Ivy DD, Mertens L, Younoszai AK, Friedberg MK. Impact of Pulmonary Hemodynamics and Ventricular Interdependence on Left Ventricular Diastolic Function in Children With Pulmonary Hypertension. Circ Cardiovasc Imaging. 2016 Sep; 9(9).
    View in: PubMed
    Score: 0.188
  26. Driessen MM, Hui W, Bijnens BH, Dragulescu A, Mertens L, Meijboom FJ, Friedberg MK. Adverse ventricular-ventricular interactions in right ventricular pressure load: Insights from pediatric pulmonary hypertension versus pulmonary stenosis. Physiol Rep. 2016 Jun; 4(11).
    View in: PubMed
    Score: 0.185
  27. Dallaire F, Slorach C, Bradley T, Hui W, Sarkola T, Friedberg MK, Jaeggi E, Dragulescu A, Mahmud FH, Daneman D, Mertens L. Pediatric Reference Values and Z Score Equations for Left Ventricular Systolic Strain Measured by Two-Dimensional Speckle-Tracking Echocardiography. J Am Soc Echocardiogr. 2016 08; 29(8):786-793.e8.
    View in: PubMed
    Score: 0.185
  28. Grotenhuis HB, Ruijsink B, Chetan D, Dragulescu A, Friedberg MK, Kotani Y, Caldarone CA, Honjo O, Mertens LL. Impact of Norwood versus hybrid palliation on cardiac size and function in hypoplastic left heart syndrome. Heart. 2016 06 15; 102(12):966-74.
    View in: PubMed
    Score: 0.182
  29. Forsha D, Slorach C, Chen CK, Sherman A, Mertens L, Barker P, Kisslo J, Friedberg MK. Patterns of Mechanical Inefficiency in Pediatric Dilated Cardiomyopathy and Their Relation to Left Ventricular Function and Clinical Outcomes. J Am Soc Echocardiogr. 2016 Mar; 29(3):226-36.
    View in: PubMed
    Score: 0.179
  30. Burkett DA, Slorach C, Patel SS, Redington AN, Ivy DD, Mertens L, Younoszai AK, Friedberg MK. Left Ventricular Myocardial Function in Children With Pulmonary Hypertension: Relation to Right Ventricular Performance and Hemodynamics. Circ Cardiovasc Imaging. 2015 Aug; 8(8).
    View in: PubMed
    Score: 0.175
  31. Dallaire F, Slorach C, Hui W, Sarkola T, Friedberg MK, Bradley TJ, Jaeggi E, Dragulescu A, Har RL, Cherney DZ, Mertens L. Reference values for pulse wave Doppler and tissue Doppler imaging in pediatric echocardiography. Circ Cardiovasc Imaging. 2015 Feb; 8(2):e002167.
    View in: PubMed
    Score: 0.169
  32. Okumura K, Humpl T, Dragulescu A, Mertens L, Friedberg MK. Longitudinal assessment of right ventricular myocardial strain in relation to transplant-free survival in children with idiopathic pulmonary hypertension. J Am Soc Echocardiogr. 2014 Dec; 27(12):1344-51.
    View in: PubMed
    Score: 0.165
  33. Mondal T, Slorach C, Manlhiot C, Hui W, Kantor PF, McCrindle BW, Mertens L, Friedberg MK. Prognostic implications of the systolic to diastolic duration ratio in children with idiopathic or familial dilated cardiomyopathy. Circ Cardiovasc Imaging. 2014 Sep; 7(5):773-80.
    View in: PubMed
    Score: 0.164
  34. Forsha D, Slorach C, Chen CK, Stephenson EA, Risum N, Hornik C, Wagner G, Mertens L, Barker P, Kisslo J, Friedberg MK. Classic-pattern dyssynchrony and electrical activation delays in pediatric dilated cardiomyopathy. J Am Soc Echocardiogr. 2014 Sep; 27(9):956-64.
    View in: PubMed
    Score: 0.163
  35. Cifra B, Dragulescu A, Brun H, Slorach C, Friedberg MK, Manlhiot C, McCrindle BW, Dipchand A, Mertens L. Left ventricular myocardial response to exercise in children after heart transplant. J Heart Lung Transplant. 2014 Dec; 33(12):1241-7.
    View in: PubMed
    Score: 0.163
  36. Dragulescu A, Friedberg MK, Grosse-Wortmann L, Redington A, Mertens L. Effect of chronic right ventricular volume overload on ventricular interaction in patients after tetralogy of Fallot repair. J Am Soc Echocardiogr. 2014 Aug; 27(8):896-902.
    View in: PubMed
    Score: 0.161
  37. Hui W, Slorach C, Dragulescu A, Mertens L, Bijnens B, Friedberg MK. Mechanisms of right ventricular electromechanical dyssynchrony and mechanical inefficiency in children after repair of tetralogy of fallot. Circ Cardiovasc Imaging. 2014 Jul; 7(4):610-8.
    View in: PubMed
    Score: 0.160
  38. Di Maria MV, Younoszai AK, Mertens L, Landeck BF, Ivy DD, Hunter KS, Friedberg MK. RV stroke work in children with pulmonary arterial hypertension: estimation based on invasive haemodynamic assessment and correlation with outcomes. Heart. 2014 Sep; 100(17):1342-7.
    View in: PubMed
    Score: 0.160
  39. Okumura K, Slorach C, Mroczek D, Dragulescu A, Mertens L, Redington AN, Friedberg MK. Right ventricular diastolic performance in children with pulmonary arterial hypertension associated with congenital heart disease: correlation of echocardiographic parameters with invasive reference standards by high-fidelity micromanometer catheter. Circ Cardiovasc Imaging. 2014 May; 7(3):491-501.
    View in: PubMed
    Score: 0.158
  40. Forsey J, Benson L, Rozenblyum E, Friedberg MK, Mertens L. Early changes in apical rotation in genotype positive children with hypertrophic cardiomyopathy mutations without hypertrophic changes on two-dimensional imaging. J Am Soc Echocardiogr. 2014 Feb; 27(2):215-21.
    View in: PubMed
    Score: 0.156
  41. Bharucha T, Khan R, Mertens L, Friedberg MK. Right ventricular mechanical dyssynchrony and asymmetric contraction in hypoplastic heart syndrome are associated with tricuspid regurgitation. J Am Soc Echocardiogr. 2013 Oct; 26(10):1214-1220.
    View in: PubMed
    Score: 0.152
  42. Forsey J, Friedberg MK, Mertens L. Speckle tracking echocardiography in pediatric and congenital heart disease. Echocardiography. 2013 Apr; 30(4):447-59.
    View in: PubMed
    Score: 0.149
  43. Friedberg MK, Fernandes FP, Roche SL, Slorach C, Grosse-Wortmann L, Manlhiot C, Fackoury C, McCrindle BW, Mertens L, Kantor PF. Relation of right ventricular mechanics to exercise tolerance in children after tetralogy of Fallot repair. Am Heart J. 2013 Apr; 165(4):551-7.
    View in: PubMed
    Score: 0.148
  44. Dragulescu A, Mertens L, Friedberg MK. Interpretation of left ventricular diastolic dysfunction in children with cardiomyopathy by echocardiography: problems and limitations. Circ Cardiovasc Imaging. 2013 Mar 01; 6(2):254-61.
    View in: PubMed
    Score: 0.147
  45. Dragulescu A, Grosse-Wortmann L, Redington A, Friedberg MK, Mertens L. Differential effect of right ventricular dilatation on myocardial deformation in patients with atrial septal defects and patients after tetralogy of Fallot repair. Int J Cardiol. 2013 Sep 30; 168(2):803-10.
    View in: PubMed
    Score: 0.144
  46. Ahmad N, Kantor PF, Grosse-Wortmann L, Seller N, Jaeggi ET, Friedberg MK, Mertens L. Influence of RV restrictive physiology on LV diastolic function in children after tetralogy of Fallot repair. J Am Soc Echocardiogr. 2012 Aug; 25(8):866-73.
    View in: PubMed
    Score: 0.141
  47. Friedberg MK, Fernandes FP, Roche SL, Grosse-Wortmann L, Manlhiot C, Fackoury C, Slorach C, McCrindle BW, Mertens L, Kantor PF. Impaired right and left ventricular diastolic myocardial mechanics and filling in asymptomatic children and adolescents after repair of tetralogy of Fallot. Eur Heart J Cardiovasc Imaging. 2012 Nov; 13(11):905-13.
    View in: PubMed
    Score: 0.139
  48. Alghamdi MH, Grosse-Wortmann L, Ahmad N, Mertens L, Friedberg MK. Can simple echocardiographic measures reduce the number of cardiac magnetic resonance imaging studies to diagnose right ventricular enlargement in congenital heart disease? J Am Soc Echocardiogr. 2012 May; 25(5):518-23.
    View in: PubMed
    Score: 0.138
  49. Fernandes FP, Manlhiot C, Roche SL, Grosse-Wortmann L, Slorach C, McCrindle BW, Mertens L, Kantor PF, Friedberg MK. Impaired left ventricular myocardial mechanics and their relation to pulmonary regurgitation, right ventricular enlargement and exercise capacity in asymptomatic children after repair of tetralogy of Fallot. J Am Soc Echocardiogr. 2012 May; 25(5):494-503.
    View in: PubMed
    Score: 0.137
  50. Bharucha T, Fernandes F, Slorach C, Mertens L, Friedberg MK. Measurement of effective aortic valve area using three-dimensional echocardiography in children undergoing aortic balloon valvuloplasty for aortic stenosis. Echocardiography. 2012 Apr; 29(4):484-91.
    View in: PubMed
    Score: 0.136
  51. Dragulescu A, Grosse-Wortmann L, Fackoury C, Riffle S, Waiss M, Jaeggi E, Yoo SJ, Friedberg MK, Mertens L. Echocardiographic assessment of right ventricular volumes after surgical repair of tetralogy of Fallot: clinical validation of a new echocardiographic method. J Am Soc Echocardiogr. 2011 Nov; 24(11):1191-8.
    View in: PubMed
    Score: 0.134
  52. Fernandes FP, Manlhiot C, McCrindle BW, Mertens L, Kantor PF, Friedberg MK. Usefulness of mitral regurgitation as a marker of increased risk for death or cardiac transplantation in idiopathic dilated cardiomyopathy in children. Am J Cardiol. 2011 May 15; 107(10):1517-21.
    View in: PubMed
    Score: 0.129
  53. Koopman LP, Slorach C, Manlhiot C, McCrindle BW, Jaeggi ET, Mertens L, Friedberg MK. Assessment of myocardial deformation in children using Digital Imaging and Communications in Medicine (DICOM) data and vendor independent speckle tracking software. J Am Soc Echocardiogr. 2011 Jan; 24(1):37-44.
    View in: PubMed
    Score: 0.126
  54. Hui W, Slorach C, Bradley TJ, Jaeggi ET, Mertens L, Friedberg MK. Measurement of right ventricular mechanical synchrony in children using tissue Doppler velocity and two-dimensional strain imaging. J Am Soc Echocardiogr. 2010 Dec; 23(12):1289-96.
    View in: PubMed
    Score: 0.125
  55. Koopman LP, Slorach C, Hui W, Manlhiot C, McCrindle BW, Friedberg MK, Jaeggi ET, Mertens L. Comparison between different speckle tracking and color tissue Doppler techniques to measure global and regional myocardial deformation in children. J Am Soc Echocardiogr. 2010 Sep; 23(9):919-28.
    View in: PubMed
    Score: 0.123
  56. Mohammed A, Mertens L, Friedberg MK. Relations between systolic and diastolic function in children with dilated and hypertrophic cardiomyopathy as assessed by tissue Doppler imaging. J Am Soc Echocardiogr. 2009 Feb; 22(2):145-51.
    View in: PubMed
    Score: 0.111
  57. Burkett DA, Patel SS, Mertens L, Friedberg MK, Ivy DD. Relationship Between Left Ventricular Geometry and Invasive Hemodynamics in Pediatric Pulmonary Hypertension. Circ Cardiovasc Imaging. 2020 May; 13(5):e009825.
    View in: PubMed
    Score: 0.061
  58. Morgan CT, Mueller B, Thakur V, Guerra V, Jull C, Mertens L, Friedberg M, Golding F, Seed M, Miner SES, Jaeggi ET, Manlhiot C, Nield LE. Improving Prenatal Diagnosis of Coarctation of the Aorta. Can J Cardiol. 2019 04; 35(4):453-461.
    View in: PubMed
    Score: 0.055
  59. Driessen MMP, Leiner T, Sieswerda GT, van Dijk APJ, Post MC, Friedberg MK, Mertens L, Doevendans PA, Snijder RJ, Hulzebos EH, Meijboom FJ. RV adaptation to increased afterload in congenital heart disease and pulmonary hypertension. PLoS One. 2018; 13(10):e0205196.
    View in: PubMed
    Score: 0.055
  60. Lopez C, Mertens L, Dragulescu A, Landeck B, Younoszai A, Friedberg MK, Hunter K, Di Maria MV. Strain and Rotational Mechanics in Children With Single Left Ventricles After Fontan. J Am Soc Echocardiogr. 2018 12; 31(12):1297-1306.
    View in: PubMed
    Score: 0.055
  61. Grattan M, Mertens L, Grosse-Wortmann L, Friedberg MK, Cifra B, Dragulescu A. Ventricular Torsion in Young Patients With Single-Ventricle Anatomy. J Am Soc Echocardiogr. 2018 12; 31(12):1288-1296.
    View in: PubMed
    Score: 0.055
  62. Yim D, Mertens L, Morgan CT, Friedberg MK, Grosse-Wortmann L, Dragulescu A. Impact of surgical pulmonary valve replacement on ventricular mechanics in children with repaired tetralogy of Fallot. Int J Cardiovasc Imaging. 2017 May; 33(5):711-720.
    View in: PubMed
    Score: 0.048
  63. Cifra B, Mertens L, Mirkhani M, Slorach C, Hui W, Manlhiot C, Friedberg MK, Dragulescu A. Systolic and Diastolic Myocardial Response to Exercise in a Healthy Pediatric Cohort. J Am Soc Echocardiogr. 2016 07; 29(7):648-54.
    View in: PubMed
    Score: 0.046
  64. Schantz D, Benson L, Windram J, Wong D, Dragulescu A, Yoo SJ, Mertens L, Friedberg M, Al Nafisi B, Grosse-Wortmann L. Abnormal Mitral Valve Dimensions in Pediatric Patients with Hypertrophic Cardiomyopathy. Pediatr Cardiol. 2016 Apr; 37(4):784-8.
    View in: PubMed
    Score: 0.046
  65. Di Maria MV, Burkett DA, Younoszai AK, Landeck BF, Mertens L, Ivy DD, Friedberg MK, Hunter KS. Echocardiographic estimation of right ventricular stroke work in children with pulmonary arterial hypertension: comparison with invasive measurements. J Am Soc Echocardiogr. 2015 Nov; 28(11):1350-7.
    View in: PubMed
    Score: 0.044
  66. Hussain T, Dragulescu A, Benson L, Yoo SJ, Meng H, Windram J, Wong D, Greiser A, Friedberg M, Mertens L, Seed M, Redington A, Grosse-Wortmann L. Quantification and significance of diffuse myocardial fibrosis and diastolic dysfunction in childhood hypertrophic cardiomyopathy. Pediatr Cardiol. 2015 Jun; 36(5):970-8.
    View in: PubMed
    Score: 0.042
  67. Weber R, Kantor P, Chitayat D, Friedberg MK, Golding F, Mertens L, Nield LE, Ryan G, Seed M, Yoo SJ, Manlhiot C, Jaeggi E. Spectrum and outcome of primary cardiomyopathies diagnosed during fetal life. JACC Heart Fail. 2014 Aug; 2(4):403-11.
    View in: PubMed
    Score: 0.041
  68. Koopman LP, Slorach C, Manlhiot C, McCrindle BW, Friedberg MK, Mertens L, Jaeggi ET. Myocardial tissue Doppler velocity imaging in children: comparative study between two ultrasound systems. J Am Soc Echocardiogr. 2010 Sep; 23(9):929-37.
    View in: PubMed
    Score: 0.031
Connection Strength

The connection strength for concepts is the sum of the scores for each matching publication.

Publication scores are based on many factors, including how long ago they were written and whether the person is a first or senior author.