Neurosensory impairment after surgical closure of patent ductus arteriosus in extremely low birth weight infants: results from the Trial of Indomethacin Prophylaxis in Preterms - Kabra, N S; Schmidt, B; Roberts, R S; Doyle, L W; Papile, L; Fanaroff, A.; Trial of Indomethacin Prophylaxis in Preterms Investigators (J Pediatr, 2007)