[1] Univ Childrens Hosp Zurich, Childrens Res Ctr, Div Clin Chem & Biochem, Zurich, Switzerland
[2] Univ Zurich, Zurich Ctr Integrat Human Physiol, Zurich, Switzerland
[3] Univ Childrens Hosp Zurich, Childrens Res Ctr, Div Metab, Zurich, Switzerland
[4] HCPA, Med Genet Serv, Porto Alegre, RS, Brazil
[5] Univ Fed Rio Grande do Sul, Dept Genet, Porto Alegre, RS, Brazil
[6] Univ Lausanne Hosp, Ctr Mol Dis, Lausanne, Switzerland
[7] Univ Childrens Hosp Bern, Paediat Endocrinol Diabetol & Metab, Bern, Switzerland
[8] Inselspital Bern, Univ Inst Clin Chem, Bern, Switzerland