Kopp JB 1, Winkler CA 2, Zhao X 3, Radeva MK 4, Gassman JJ 4, D'Agati VD 5, Nast CC 6, Wei C 7, Reiser J 7, Guay-Woodford LM 8, Pollak MR 9, Hildebrandt F 10, Moxey-Mims M 11, Gipson DS 12, Trachtman H 13, Friedman AL 14, Kaskel FJ 15; FSGS-CT Study Consortium.