PT - JOURNAL ARTICLE AU - Landsman, Joan B. AU - Grist, N. R. AU - Ross, Constance A. C. TI - ECHO 9 Virus Infection and Congenital Malformations AID - 10.1136/jech.18.3.152 DP - 1964 Jul 01 TA - British Journal of Preventive & Social Medicine PG - 152--156 VI - 18 IP - 3 4099 - http://jech.bmj.com/content/18/3/152.short 4100 - http://jech.bmj.com/content/18/3/152.full SO - Br J Prev Soc Med1964 Jul 01; 18