1 Neonatal Intensive Care Unit, Puerta del Mar University Hospital, Cádiz, Spain. Electronic address: almudena.alonso.sspa@juntadeandalucia.es.
2 Neonatal Intensive Care Unit, Puerta del Mar University Hospital, Cádiz, Spain; Pediatric Intensive Care Unit. Hospital Universitario Puerta del Mar, Cádiz, Spain.