[1] Royal Matern Hosp, Reg Neonatal Unit, Belfast, Antrim, North Ireland
[2] Univ Hosp Ancona, Univ Polytech Della Marche, Dept Neonatol, Ancona, Italy
[3] Rigshosp, Dept Neonatol, Copenhagen, Denmark
[4] Univ Copenhagen, Copenhagen, Denmark
[5] Univ Oulu, Oulu Univ Hosp, Dept Children & Adolescents, Oulu, Finland
[6] Univ Oulu, Med Res Ctr, Oulu, Finland
[7] Med Univ Vienna, Dept Pediat & Adolescent Med, Div Neonatol, Vienna, Austria
[8] Marmara Univ, Med Fac, Dept Pediat, Istanbul, Turkiye
[9] Leiden Univ, Med Ctr, Leiden, Netherlands
[10] Charles Univ Prague, Gen Fac Hosp, Dept Obstet & Gynecol, Div Neonatol, Prague, Czech Republic
[11] Charles Univ Prague, Fac Med 1, Dept Pediat, Prague, Czech Republic
[12] Univ Bristol, Fac Hlth Sci, Neonatal Res Unit, Bristol, Avon, England
[13] Univ Oxford, Med Sci Div, Natl Perinatal Epidemiol Unit, Oxford Populat Hlth, Oxford, England
[14] Univ Oslo, Oslo Univ Hosp, Rikshosp, Dept Pediat Res, Oslo, Norway
[15] Northwestern Univ, Ann & Robert H Lurie Childrens Hosp Chicago, Feinberg Sch Med, Chicago, IL USA
[16] Univ Lausanne, Lausanne, Switzerland