[1] Complejo Asistencial Universitario de León,Pediatric Intensive Care Unit
[2] Working Group On Ultrasound,Neonatal Intensive Care Unit
[3] Spanish Society of Neonatology (SENeo),Neonatal Intensive Care Unit
[4] Working Group On Bedside Ultrasound,Neonatal Intensive Care Unit
[5] Spanish Society of Pediatric Intensive Care (SECIP),Neonatal Intensive Care Unit
[6] Biomedicine Institute of León,Neonatal Intensive Care Unit
[7] University of León,Pediatric Emergency, Intermediate and Critical Care Unit
[8] Hospital Universitario Puerta del Mar de Cádiz,CLINURSID Research Group
[9] Research Unit,undefined
[10] Biomedical Research and Innovation Institute of Cádiz (INiBICA),undefined
[11] Puerta del Mar University Hospital,undefined
[12] Hospital Clinic Barcelona,undefined
[13] Center for Maternal-Fetal and Neonatal Medicine (BCNatal),undefined
[14] Hospital Universitario La Paz,undefined
[15] Hospital Universitario Basurto,undefined
[16] Hospital Universitario,undefined
[17] Research Institute Hospital,undefined
[18] Complejo Hospitalario de Santiago de Compostela,undefined
[19] Health Research Institute of Santiago de Compostela (IDIS),undefined
[20] University of Santiago de Compostela,undefined