RT Journal Article SR Electronic T1 Prevalence of SMN1 deletion and duplication in carrier and normal populations: implication for genetic counselling JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP e39 OP e39 DO 10.1136/jmg.40.4.e39 VO 40 IS 4 A1 V Cusin A1 O Clermont A1 B Gérard A1 D Chantereau A1 J Elion YR 2003 UL http://jmg.bmj.com/content/40/4/e39.abstract AB