1. Demonstrator, Department of Community Medicine, Nil Ratan Sircar Medical College and Hospital, Kolkata, West Bengal, India
2. Professor, Department of Community Medicine, KPC Medical College and Hospital, Kolkata, West Bengal, India
3. Associate Professor, Department of Community Medicine, North Bengal Medical College and Hospital, Darjeeling, West Bengal, India
4. Associate Professor, Department of Community Medicine, Nil Ratan Sircar Medical College and Hospital, Kolkata, West Bengal, India