1Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Rua Jorge Viterbo Ferreira, no 228, 4050-313 Porto, Portugal
2Paediatric Gastroenterology Service, Department of Child and Adolescent Medicine, Centro Hospitalar do Porto, Largo Abel Salazar, 4099-001 Porto, Portugal
3Paediatric Service, Unidade Hospitalar de Famalicao, Centro Hospitalar do Médio Ave, Rua de Cupertino de Miranda, 4764-958 Vila Nova de Famalicão, Portugal
4Paediatric Service, Department of Child and Adolescent, Centro Hospitalar do Porto; Largo Abel Salazar, 4099-001 Porto, Portugal
5Metabolic Diseases Unit, Paediatric Service, Department of Child and Adolescent, Centro Hospitalar do Porto; Largo Abel Salazar, 4099-001 Porto, Portugal