RT Journal Article SR Electronic T1 Popliteal pterygium syndrome. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 320 OP 326 DO 10.1136/jmg.27.5.320 VO 27 IS 5 A1 U G Froster-Iskenius YR 1990 UL http://jmg.bmj.com/content/27/5/320.abstract AB