AU - Bischoff-Ferrari HA, Willett WC, Wong JB, et al TI - Relationship between bone, fracture, and exercise: The key role of vitamin d—reply PT - JOUR DP - 2009 TA - Archives of Internal Medicine pages = {1633-1638}, VI - 169 IP - 17 AID - 10.1001/archinternmed.2009.323 [doi] 4100 - http://dx.doi.org/10.1001/archinternmed.2009.323 SO - Archives of Internal Medicine September 28, 2009 169(17):1633