[1] All India Inst Med Sci AIIMS Bhopal, Dept Community & Family Med, Bhopal, Madhya Pradesh, India
[2] Sarat Chandra Chattopadhyay Govt Med Coll & Hosp, Dept Community Med, Howrah, W Bengal, India
[3] All India Inst Med Sci AIIMS Kalyani, Dept Community & Family Med, Kalyani, W Bengal, India