RT Journal Article SR Electronic T1 A 45,XX,21--child: attempt at a cytological and clinical interpretation of the karyotype. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 110 OP 115 DO 10.1136/jmg.9.1.110 VO 9 IS 1 A1 U Gripenberg A1 J Elfving A1 L Gripenberg YR 1972 UL http://jmg.bmj.com/content/9/1/110.abstract AB