[1] Royal Matern Hosp, Reg Neonatal Unit, 274 Grosvenor Rd, Belfast BT12 6BB, Antrim, North Ireland
[2] Univ Hosp Ancona, Univ Polytech Marche, Dept Neonatol, Ancona, Italy
[3] Rigshosp, Dept Neonatol, Copenhagen, Denmark
[4] Univ Copenhagen, Copenhagen, Denmark
[5] Univ Oulu, Oulu Univ Hosp, Dept Pediat & Adolescence, Oulu, Finland
[6] Univ Oulu, Med Res Ctr, PEDEGO Res Unit, Oulu, Finland
[7] Marmara Univ, Sch Med, Dept Pediat, Div Neonatol, Istanbul, Turkey
[8] Charles Univ Prague, Gen Fac Hosp, Dept Obstet & Gynecol, Div Neonatol, Prague, Czech Republic
[9] Charles Univ Prague, Fac Med 1, Prague, Czech Republic
[10] Univ Oslo, Rikshosp, Oslo Univ Hosp, Dept Pediat Res, Oslo, Norway
[11] CHU Vaudois, Div Pediat, Lausanne, Switzerland
[12] Univ Lausanne, Lausanne, Switzerland
[13] Univ Childrens Hosp, Dept Pediat, Wurzburg, Germany
[14] Univ & Polytech Hosp La Fe, Hlth Res Inst La Fe, Dept Pediat, Neonatal Res Unit, Valencia, Spain
[15] Univ Med Ctr, Dept Obstet & Gynecol, Div Obstet, Utrecht, Netherlands
[16] Queens Univ Belfast, Royal Matern Hosp, Dept Child Hlth, Belfast BT7 1NN, Antrim, North Ireland