[1] Hamad Med Corp, Dept Pathol & Lab Med, Metab Lab, POB 3050, Doha, Qatar
[2] St Joseph Univ, Med Genet Unit, Newborn Screening Lab, Fac Med, BP Riad El Solh, Beirut 115076, Lebanon
[3] Natl Inst Publ Hlth & Environm RIVM, Ctr Hlth Protect, Head Reference Lab Neonatal Screening, POB 1, NL-3720 BA Bilthoven, Netherlands
[4] ISNS Off, NL-3721 CK Bilthoven, Netherlands