1. Department of Gastroenterology, Dr D. Y. Patil Medical College, Pimpri, Pune, India
2. Department of Gastroenterology, G. B. Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India
3. Department of Gastrointestinal Surgery, G. B. Pant Institute of Postgraduate Medical Education and Research (GIPMER), New Delhi, India