1. Department of General Surgery, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
2. Department of Surgical Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
3. Department of Gastroenterology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
4. Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.