RT Journal Article SR Electronic T1 Reply JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 262 OP 262 DO 10.1136/jmg.30.3.262-a VO 30 IS 3 A1 Golder N Wilson YR 1993 UL http://jmg.bmj.com/content/30/3/262.2.abstract AB