Calculating the fractional excretion of potassium and the urine potassium to creatinine ratio (using those crazy American units) – Precious Bodily Fluids
Evaluation of glomerular filtration rate estimation by Cockcroft–Gault, Jelliffe, Wright and Modification of Diet in Renal Disease (MDRD) formulae in oncology patients - Annals of Oncology
How to calculate the GFR from creatinine clearance - Quora