Bhowmik, K. et al. 2013. Prevalence of depression and its risk factors among patients with chronic obstructive pulmonary disease in a tertiary level hospital in West Bengal, India. South East Asia Journal of Public Health. 2, 2 (Jul. 2013), 34–40. DOI:https://doi.org/10.3329/seajph.v2i2.15942.