1 Division of Pediatric Gastroenterology, Department of Pediatrics, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, 249203, India.
2 Department of Endocrinology, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India.
3 Department of Nuclear Medicine, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India.
4 Division of Pediatric Gastroenterology, Department of Pediatrics, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, 249203, India. rishibolia@yahoo.co.in.