RT Journal Article SR Electronic T1 Medical genetics: advances in brief JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 261 OP 261 DO 10.1136/jmg.30.3.261-b VO 30 IS 3 A1 John C K Barber YR 1993 UL http://jmg.bmj.com/content/30/3/261.3.abstract AB