Banfi, G., G. Melegati, G. M. d’Eril, and A. Barassi. “Evaluation of Equations for Measuring EGFR Based on Serum Creatinine and 6 Cystatin C Values in Top Level Rugby Players”. Journal of Human Sport and Exercise, vol. 5, no. 3, Oct. 2010, pp. 370-8, doi:10.4100/jhse.2010.53.07.