aDepartment of Neonatology, APHP, Necker-Enfants Malades University Hospital

bEHU 7328 PACT, Paris Cite University, Paris, France

cCNRC Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA

dDepartment of Neonatal Intensive Care, Oslo University Hospital, Oslo, Norway

Correspondence to Alexandre Lapillonne, Neonatal Intensive Care Unit, Necker-Enfants Malades University Hospital, 149 rue de Sèvres, 75015 Paris, France. Tel: +33 (0)1 71 19 61 75; e-mail: [email protected]