[1] Univ Nova Lisboa, Fac Ciencias Med, NOVA Med Sch, Nutr & Metab, Lisbon, Portugal
[2] Univ Nova Lisboa, Comprehens Hlth Res Ctr, Lisbon, Portugal
[3] Birmingham Childrens Hosp, Dietet Dept, Steelhouse Lane, Birmingham, W Midlands, England
[4] CINTESIS Ctr Hlth Technol & Serv Res, Porto, Portugal
[5] Univ Groningen, Univ Med Ctr Groningen, Beatrix Childrens Hosp, Div Metab Dis, Groningen, Netherlands
[6] Copenhagen Univ Hosp, Dept PKU, Copenhagen, Denmark
[7] CHU Nancy, Hop Enfants Brabois, Dept Paediat, Vandoeuvre Les Nancy, France