The association between medical costs and participation in the vitality health promotion program among 948,974 members of a South African health insurance company.
Patel DN, Lambert EV, da Silva R, Greyling M, Nossel C, Noach A, Derman W, Gaziano T. The association between medical costs and participation in the vitality health promotion program among 948,974 members of a South African health insurance company. Am J Health Promot. 2010 Jan-Feb; 24(3):199-204.