1 Cardiology Unit, Department of Paediatrics, Ca'n Misses District Hospital, Corona Street, 07800 Eivissa, Spain. Electronic address: curune@yahoo.es.
2 La Vileta Surgery, Paediatric Unit, Department of Primary Care, Matamusinos Street, 07013 Palma de Mallorca, Spain. Electronic address: marianna.mambie@gmail.com.
3 La Vileta Surgery, Paediatric Unit, Department of Primary Care, Matamusinos Street, 07013 Palma de Mallorca, Spain; Balearic Institute of Medical Research (IdISBa), Valldemossa Road, 07120 Palma de Mallorca, Spain. Electronic address: drsverd@gmail.com.