Risk Factors for Prognosis in Patients With Severely Decreased GFR by Evans, M, Grams, ME, Sang, Y, Astor, BC, Blankestijn, PJ, Brunskill, NJ, Collins, JF, Kalra, PA, Kovesdy, CP, Levin, A, Mark, PB, Moranne, O, Rao, P, Rios, PG, Schneider, MP, Shalev, V, Zhang, H, Chang, AR, Gansevoort, RT, Matsushita, K, Zhang, L, Eckardt, K-U, Hemmelgarn, B, Wheeler, DC, CKD Prognosis Consortium