Ruth Del Río1, Emilia Dip Pérez2,3, Miguel Ángel Marín Gabriel4,5. 1. Deparment of Neonatology, Sant Joan de Déu Hospital, Barcelona, Spain. 2. Deparment of Psychiatry, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain. 3. Autónoma University of Barcelona, Barcelona, Spain. 4. Deparment of Pediatrics, Neonatal Unit, Puerta de Hierro-Majadahonda University Hospital, Madrid, Spain. 5. Autónoma University, Madrid, Spain.