1. Multiple chronic conditions among US adults: a 2012 update.;Ward;Prev Chronic Dis,2014
2. US Department of Health and Human Services. 2008 physical activity guidelines for Americans. Washington, DC: US Department of Health and Human Services; 2008. https://health.gov/paguidelines/pdf/paguide.pdf
3. US Department of Health and Human Services. Physical activity guidelines advisory committee report, 2008. Washington, DC: US Department of Health and Human Services; 2008. https://health.gov/paguidelines/report/pdf/CommitteeReport.pdf
4. National Heart Lung and Blood Institute. Clinical guidelines on the identifıcation, evaluation, and treatment of overweight and obesity in adults: the evidence report. Bethesda MD: US Department of Health and Human Services, National Institutes of Health, National Heart, Lung, and Blood Institute; 1998.
5. An official American Thoracic Society/European Respiratory Society statement: key concepts and advances in pulmonary rehabilitation.;Spruit;Am J Respir Crit Care Med,2013