[1] McGill Univ, Montreal Childrens Hosp, Hlth Ctr, Div Neonatol, Montreal, PQ, Canada
[2] Ctr Hosp Univ St Justine, Div Neonatol, Montreal, PQ, Canada
[3] Univ Bonn, Childrens Hosp, Dept Neonatol & Pediat Intens Care Med, Bonn, Germany
[4] Royal Hosp Children, Dept Neonatol, Glasgow, Scotland