1. Department of Community Medicine, J.N. Medical College, A.M.U., Aligarh 202002, India Tel: 91 571 2720657, atharansari777@ rediffmail.com
2. Department of Community Medicine, J.N. Medical College, A.M.U., Aligarh 202002, India, zulfiakhan@rediffmail. com
3. MD, Lecturer, Department of Community Medicine, J.N. Medical College, A.M.U., Aligarh 202002, India Email: medcom786@yahoo. co.uk