[1] Univ Nijmegen Hosp, Dept Metab Dis, NL-6500 HB Nijmegen, Netherlands
[2] Univ Nijmegen Hosp, Dept Pediat, NL-6500 HB Nijmegen, Netherlands
[3] Univ Nijmegen Hosp, Dept Pediat Endocrinol, NL-6500 HB Nijmegen, Netherlands
[4] Univ Nijmegen Hosp, Lab Pediat & Neurol, NL-6500 HB Nijmegen, Netherlands
[5] Univ Nijmegen Hosp, Clin Chem Lab, NL-6500 HB Nijmegen, Netherlands
[6] Laurentius Hosp, Dept Pediat, Roermond, Netherlands