[1] Univ Med Ctr, Dept Paediat, Metab Serv, D-20246 Hamburg, Germany
[2] Univ Med Ctr, Dept Paediat, Metab Serv, Heidelberg, Germany
[3] Univ Manitoba, Dept Biochem, Winnipeg, MB, Canada
[4] Childrens Hosp, Dublin, Ireland
[5] Clin Special Children, Strasburg, PA USA
[6] Univ Manitoba, Dept Med Genet, Winnipeg, MB, Canada