Facts and artefacts in mevalonic aciduria: development of a stable isotope dilution GCMS assay for mevalonic acid and its application to physiological fluids, tissue samples, prenatal diagnosis and carrier detection. - Hoffmann,G.F.; Sweetman,L.; Bremer,H.J.; Hunnemann,D.H.; Hyanek,J.; Kozich,V. (Clin Chim Acta, 1991)