Estimating risk of severe neonatal morbidity in preterm births under 32 weeks of gestation. - Hamilton EF; Dyachenko A; Ciampi A; Maurel K; Warrick PA; Garite TJ (The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians, 2020)