RT Journal Article SR Electronic T1 Clinical Genetics, 2nd ed JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 219 OP 220 DO 10.1136/jmg.11.2.219-a VO 11 IS 2 A1 Harris, R. YR 1974 UL http://jmg.bmj.com/content/11/2/219.2.abstract AB