Retinopathy of prematurity in infants weighing less than 500 grams at birth enrolled in the early treatment for retinopathy of prematurity study. - Wheeler DT; Dobson V; Chiang MF; Bremer DL; Gewolb IH; Phelps DL; Hardy RJ; Good WV; Fellows R; Tung BP; Palmer EA (Ophthalmology, 2011)