RT Journal Article SR Electronic T1 Cholinesterase JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 575 OP 576 DO 10.1136/jmg.24.9.575 VO 24 IS 9 A1 Hopkinson, D A YR 1987 UL http://jmg.bmj.com/content/24/9/575.abstract AB