1. Associate Professor, Dept of Medicine, North Bengal Medical College & Hospital, Sushruta Nagar, Darjeeling, West Bengal, India.
2. Assistant Professor, Dept of Medicine, North Bengal Medical College & Hospital, Sushruta Nagar, Darjeeling, West Bengal, India.
3. Professor and Head, Dept of Chest Medicine, North Bengal Medical College & Hospital, Sushruta Nagar, Darjeeling, West Bengal, India.
4. Assistant Professor, Dept of Medicine, North Bengal Medical College & Hospital, Sushruta Nagar, Darjeeling, West Bengal, India
5. Professor and Head, Department Medicine, North Bengal Medical College, West Bengal.