1 Department of Gastroenterology All India Institute of Medical Sciences, Bhubaneswar, India. Electronic address: drhemantnayak@gmail.com.
2 Department of Gastroenterology All India Institute of Medical Sciences, Bhubaneswar, India.
3 Department of Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India. Electronic address: mohindrasamir@yahoo.com.