[1] Univ Granada, Dept Biochem & Mol Biol 2, Inst Nutr & Food Technol Jose Mataix, Biomed Res Ctr, Parque Tecnol Salud,Ave Conocimiento S-N, Granada 18100, Spain
[2] Complejo Hosp Univ Granada, Inst Invest Biosanitaria, Ibs GRANADA, Granada 18014, Spain
[3] Univ Hosp Cruces, Biocruces Bizkaia Hlth Res Inst, Neonatol Unit, Baracaldo 48903, Spain
[4] Univ Zaragoza, Growth Exercise Nutr & Dev GENUD Res Grp, E-50009 Zaragoza, Spain
[5] IIS Aragon, Zaragoza 50009, Spain
[6] Hosp St Joan de Deu, BCNatal Barcelona Ctr Maternal Fetal & Neonatal M, Barcelona 08028, Spain
[7] Hosp Clin Barcelona, Barcelona 08028, Spain
[8] IR SJD, Barcelona 08028, Spain
[9] St Pau Univ Hosp, High Risk Unit, Dept Obstet & Gynecol, Barcelona 08025, Spain
[10] St Pau Univ Hosp, Biomed Res Inst St Pau IIB St Pau, Women & Perinatal Hlth Res Grp, Barcelona 08041, Spain
[11] Univ Autonoma Barcelona, Sch Med, E-08193 Barcelona, Spain
[12] BCNatal, ICGON, Hosp Clin Maternitat, Neonatol Unit, Gran Via Corts Catalanes 585, Barcelona 08007, Spain
[13] Univ Complutense Madrid, Hosp Gen Univ Gregorio Maranon, Serv Cuidados Intens Pediat, Dept Salud Publ & Materno Infantil, E-28040 Madrid, Spain
[14] Hosp Univ Marques Valdecilla, Santander 39008, Cantabria, Spain
[15] Hosp La Paz, Serv Pediat Enfermedades Infecciosas & Trop, Madrid 28046, Spain
[16] Hosp La Paz, Inst Invest, Madrid 28029, Spain
[17] RITIP, Madrid 28046, Spain
[18] Hosp La Paz, Serv Cirugia Pediat, Madrid 28046, Spain
[19] Univ Complutense, Univ Hosp 12 Octubre, Donated Milk Bank, Hlth Res Inst I 12, E-28040 Madrid, Spain
[20] Univ & Polytech Hosp La Fe, Hlth Res Inst LA Fe, Neonatal Res Grp, Valencia 46026, Spain
[21] Univ Murcia, Fac Biol, Dept Physiol, E-30100 Murcia, Spain
[22] Hosp Clin Univ Lozano Blesa, Fac Med, Dept Pediat, Zaragoza 50009, Spain
[23] Hosp St Joan de Deu, Inst Recerca St Joan de Deu, BCNatal, Neonatol Unit, Barcelona 08028, Spain
[24] La Paz Univ Hosp, Dept Neonatol, Madrid 28046, Spain
[25] European Network Excellence Pediat Clin Res, I-27100 Pavia, Italy
[26] Madrid Univ Hosp, Dept Paediat Neonatol Quironsalud, Madrid 28046, Spain
[27] La Paz Univ Hosp, IDIPAZ, Biomed Res Fdn, Madrid 28046, Spain