RT Journal Article SR Electronic T1 Reply JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 630 OP 630 DO 10.1136/jmg.33.7.630-a VO 33 IS 7 A1 Mansergh, Fiona A1 Humphries, Peter A1 Farrar, Jane YR 1996 UL http://jmg.bmj.com/content/33/7/630.2.abstract AB