University of Liège, Department of Neonatology, CHU Liège, CHR Citadelle, Liège, Belgium.
Address correspondence and reprint requests to Jacques Rigo, Department of Neonatology, CHR Citadelle, Blvd du XII de Ligne 1, 4000 Liège, Belgium (e-mail: J.Rigo@ulg.ac.be).
Received 12 November, 2013
Accepted 12 November, 2013
The authors report no conflicts of interest.