RT Journal Article SR Electronic T1 DiGeorge syndrome with discordant phenotype in monozygotic twins JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP e23 OP e23 DO 10.1136/jmg.37.9.e23 VO 37 IS 9 A1 HILLEBRAND, G A1 SIEBERT, R A1 SIMEONI, E A1 SANTER, R YR 2000 UL http://jmg.bmj.com/content/37/9/e23.abstract AB