1. Department of Pediatric Care Primary Unit, La Vileta Surgery, Health Sciences Research Institute (IUNICS), Balearic University, 07122 Palma, Spain
2. Department of Pediatrics, Division of Neonatology, Hospital Universitari Germans Trias i Pujol, Badalona, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
3. Division of Neonatology, Complexo Hospitalario Universitario de A Coruña (CHUAC), SERGAS, 15006 A Coruña, Spain
4. Division of Neonatology, Complejo Hospitalario Universitario Insular Materno-Infantil, 35016 Las Palmas, Spain
5. Division of Neonatology, Hospital Sant Joan de Déu, 07007 Barcelona, Spain