Sharma, Sanjeev Kumar, et al. “An Assessment of Self-Perceived Health Status of Patients of Diabetes Mellitus, Hypertension and Comorbidity Using Physical Functioning”. Indian Journal of Community Health, vol. 26, no. 3, Sept. 2014, pp. 254-8, http://www.iapsmupuk.org/journal/index.php/IJCH/article/view/417.