RT Journal Article SR Electronic T1 Editorial JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 1 OP 3 DO 10.1136/jmg.21.1.1 VO 21 IS 1 A1 C A Clarke YR 1984 UL http://jmg.bmj.com/content/21/1/1.abstract AB