TY - JOUR T1 - Correspondence JF - Journal of Medical Genetics JO - J Med Genet SP - 324 LP - 324 DO - 10.1136/jmg.17.4.324-a VL - 17 IS - 4 AU - Elizabeth Riley AU - Michael Swift Y1 - 1980/08/01 UR - http://jmg.bmj.com/content/17/4/324.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -