Before revision: cite Andrew S Levey, Lesley A Stevens, Christopher H Schmid, Yaping Lucy Zhang, Alejandro F Castro 3rd, Harold I Feldman, John W Kusek, Paul Eggers, Frederick Van Lente, Tom Greene, Josef Coresh;Ann Intern Med.
After revision: Unfortunately, the MDRD Study equation was developed in people with chronic kidney disease, and as such its major limitations are imprecision and systematic underestimation of measured GFR (bias) at higher/normal levelscite Andrew S Levey, Lesley A Stevens, Christopher H Schmid, Yaping Lucy Zhang, Alejandro F Castro 3rd, Harold I Feldman, John W Kusek, Paul Eggers, Frederick Van Lente, Tom Greene, Josef Coresh;Ann Intern Med.