[1] Univ Hosp Merkur, Dept Obstet & Gynecol, Div Neonatol, Zagreb, Croatia
[2] Univ Zagreb, Sch Med, Univ Hosp Ctr Zagreb, Dept Pediat, Zagreb 41001, Croatia
[3] Univ Zagreb, Sch Med, Univ Hosp Ctr, Dept Pediat Surg, Zagreb 41001, Croatia
[4] Mayo Clin, Dept Anesthesiol, Rochester, MN 55902 USA
[5] Mayo Clin, Div Neonatal Med, Rochester, MN USA
[6] Mayo Clin, Div Biomed Stat & Informat, Rochester, MN USA