Reena Nair1, Vivek S Radhakrishnan2, Mohandas K Mallath3. 1. Department of Clinical Haematology and HCT, Tata Medical Center, Kolkata, India. Electronic address: reena.nair@tmckolkata.com. 2. Department of Clinical Haematology and HCT, Tata Medical Center, Kolkata, India. 3. Department of Digestive Diseases, Tata Medical Center, Kolkata, India.