Prevalence and course of strabismus through age 6 years in participants of the Early Treatment for Retinopathy of Prematurity randomized trial. - VanderVeen DK; Bremer DL; Fellows RR; Hardy RJ; Neely DE; Palmer EA; Rogers DL; Tung B; Good WV (Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus, 2011)