Participation in Fitness-Related Activities of an Incentive-Based Health Promotion Program and Hospital Costs: A Retrospective Longitudinal Study. - Patel, Deepak; Lambert, Estelle V.; da Silva, Roseanne; Greyling, Mike; Kolbe-Alexander, Tracy; Noach, Adam; Conradie, Jaco; Nossel, Craig; Borresen, Jill; Gaziano, Thomas (American Journal of Health Promotion, 2011)