[1] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Clin Sci & Community Hlth, I-20122 Milan, Italy
[2] IRCCS Ist Giannina Gaslini, Neonatal Intens Care Unit, I-16148 Genoa, Italy
[3] San Gerardo Hosp, MBBM Fdn, Neonatal Intens Care Unit, I-20900 Monza, Italy
[4] Childrens Hosp Eastern Ontario, Div Neonatol, Dept Pediat, Ottawa, ON K1H 8L1, Canada
[5] Ottawa Hosp, Res Inst, Regenerat Med Program, Sprott Ctr Stem Cell Res, Ottawa, ON K1H 8L6, Canada
[6] Univ Ottawa, Sinclair Inst Regenerat Med, Dept Cellular & Mol Med, Ottawa, ON K1H 8L6, Canada