Social support, knowledge, and self-efficacy as correlates of osteoporosis preventive behaviors among preadolescent females. - Ievers-Landis, C.E.; Burant, C.; Drotar, D.; Morgan, L.; Trapl, E.S.; Kwoh, C.K.; Ievers-Landis, Carolyn E; Burant, Christopher; Drotar, Dennis; Morgan, Larissa; Trapl, Erika S; Kwoh, C Kent (Journal of Pediatric Psychology, 2003)