RT Journal Article SR Electronic T1 Reply JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 71 OP 71 DO 10.1136/jmg.29.1.71-a VO 29 IS 1 A1 Turner, Gillian A1 Partington, Michael W YR 1992 UL http://jmg.bmj.com/content/29/1/71.2.abstract AB