RT Journal Article SR Electronic T1 Reply JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 350 OP 350 DO 10.1136/jmg.35.4.350 VO 35 IS 4 A1 M A Sabry A1 E A R Ismail A1 NAL-Torki A1 S Farah YR 1998 UL http://jmg.bmj.com/content/35/4/350.1.abstract AB