1 Division of Metabolism, Cruces University Hospital, Plaza de Cruces, s/n, 48903 Barakaldo, Spain.
2 Metabolic Disorders, Dietetics and Nutrition Unit, Virgen del Rocío University Hospital, Avda. Manuel Siurot, s/n, 41013 Sevilla, Spain.
3 Unit of Diagnosis and Treatment of Congenital Metabolic Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, CIBERER, Health Research Institute of Santiago de Compostela (IDIS), A Choupana, s/n, 15706 Santiago de Compostela, A Coruña, Spain.
4 Nutrition and Metabolopathologies Unit, La Fe University Hospital, Bulevar Sur, s/n, 46026 Valencia, Spain.
5 Gastroenterology, Hepatology and Child Nutrition Unit, Carlos Haya University Hospital, Avda. Arroyo de los Ángeles, s/n, 29011 Málaga, Spain.
6 Paediatrics Unit, Río Hortega University Hospital, Calle Dulzaina, 2, 47012 Valladolid, Spain.
7 Gastroenterology Unit, Virgen de la Arrixaca University Hospital, Ctra. Madrid-Cartagena, s/n, 30120 El Palmar, Murcia, Spain.
8 Metabolic Pathologies Unit, Miguel Servet University Hospital, Paseo de Isabel La Católica, 1-3, 50009 Zaragoza, Spain.
9 Nephrology and Metabolism Unit, Marqués de Valdecilla University Hospital, Avda. Valdecilla, 25, 39008 Santander, Spain.
10 Paediatrics Unit, Nuestra Señora de la Candelaria University Hospital, Carretera del Rosario, 145, 38010 Santa Cruz de Tenerife, Spain.
11 Metabolic Pathologies and Neuropaediatrics Unit, Son Espases University Hospital, Carretera de Valldemossa, 79, 07120 Palma de Mallorca, Spain.
12 Metabolic Pathologies Unit, Maternal and Child Hospital, Calle de la Violeta, 1, 06010 Badajoz, Spain.
13 Gastroenterology and Paediatric Nutrition Unit, Virgen del Camino Hospital, Calle de Irunlarrea, 4, 31008 Pamplona, Spain.