R Amita1, S Sandhyamani1, M Unnikrishnan2. 1. Department of Pathology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India E-mail: amita.rnair@sctimst.ac.in. 2. Department of Cardiovascular and Thoracic Surgery, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.