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Citation Select	Burkhardt H, Hahn T, Gretz N, Gladisch R, Bedside estimation of the glomerular filtration rate in hospitalized elderly patients. Nephron Clin Pract. 2005;101(1):c1-8
Citation Select	Poggio ED, Wang X, Greene T, Van Lente F, Hall PM, Performance of the modification of diet in renal disease and Cockcroft-Gault equations in the estimation of GFR in health and in chronic kidney disease. J Am Soc Nephrol. 2005 Feb;16(2):459-66
Citation Select	Lamb EJ, Webb MC, Simpson DE, Coakley AJ, Newman DJ, O,Riordan SE Estimation of glomerular filtration rate in older patients with chronic renal insufficiency: is the modification of diet in renal disease formula an improvement? J Am Geriatr Soc. 2003 Jul;51(7):1012-7