Nirmal Kumar Mandal1, Banamali Sinhamahapatra2, Nirmalya Sinha2, Dipta Kanti Mukhopadhyay2, Rama Das2, Akhil Bandhu Biswas3
1N.R.S. Medical College, Kolkata.
2Department of Community Medicine, B.S. Medical College, Bankura, INDIA.
3Institute of Health and Family Welfare, Kolkata, West Bengal.