RT Journal Article SR Electronic T1 Reply to letters regarding clinical features of chromosome 22q11 deletion JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 347 OP 347 DO 10.1136/jmg.35.4.347 VO 35 IS 4 A1 Ryan, A A1 Goodship, J A A1 Wilson, D I YR 1998 UL http://jmg.bmj.com/content/35/4/347.1.abstract AB