[1] St Marys Hosp, Imperial Coll Healthcare NHS Trust, Dept Paediat, London W2 1NY, England
[2] John Radcliffe Hosp, Natl Blood Serv, Oxford OX3 9BQ, England
[3] Sanquin Res & Sanquin Diagnost Serv, NL-1006 AD Amsterdam, Netherlands
[4] Sanquin Consulting Serv, Amsterdam, Netherlands
[5] Acad Med Ctr, Dept Gastroenterol & Hepatol, Amsterdam, Netherlands
[6] Royal Melbourne Hosp, Australian Red Cross Blood Serv, S Melbourne, Vic 3205, Australia
[7] Royal Childrens Hosp, Parkville, Vic 3052, Australia
[8] Sirio Libanes Hosp Blood Bank, Sao Paulo, Brazil
[9] Univ Toronto, Toronto, ON M5S 1A8, Canada
[10] Canadian Blood Serv, Ottawa, ON K1G 4J5, Canada
[11] Univ Helsinki, Cent Hosp, Dept Pediat, Neonatol Sect,Jorvi Hosp, Espoo, Finland
[12] Finnish Red Cross Blood Serv, Helsinki, Finland
[13] Fdn IRCCS Osped Maggiore Policlin Mangiagelli & R, Ctr Trasfus & Immunoematol, Milan, Italy
[14] Univ Milan, Fdn IRCCS Osped Maggiore Policlin Mangiagelli & R, NICU, Milan, Italy
[15] Univ Milan, Fdn IRCCS Osped Maggiore Policlin Mangiagelli & R, Inst Pediat & Neonatol, Milan, Italy
[16] Leiden Univ, Med Ctr, Dept Neonatol, Leiden, Netherlands
[17] Emory Univ, Dept Pathol, Atlanta, GA 30322 USA
[18] Univ Iowa, Coll Med, Iowa City, IA 52242 USA
[19] Childrens Natl Med Ctr, Dept Lab Med, Washington, DC 20010 USA