AU - Ginde AA, Liu MC, Camargo CA, Jr TI - DEmographic differences and trends of vitamin d insufficiency in the us population, 1988-2004 PT - JOUR DP - 2009 TA - Archives of Internal Medicine pages = {626-632}, VI - 169 IP - 6 AID - 10.1001/archinternmed.2008.604 [doi] 4100 - http://dx.doi.org/10.1001/archinternmed.2008.604 SO - Archives of Internal Medicine March 23, 2009 169(6):626