Affiliation: | 1. Physiologisches-Chemisches Institut der Universit?t Erlangen-Nürnberg, Erlangen, FRG 2. Division of Inherited Metabolic Diseases, The M.R.C. Clinical Research Centre, HA1 3VJ, Harrow, Middlesex, UK 3. Division of Clinical Chemistry, The M.R.C. Clinical Research Centre, HA1 3VJ, Harrow, Middlesex, UK
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