S Kathuria1, S Karmakar1, A Singh2, S P Singh3. 1. Department of Dermatology and STD, Safdarjung Hospital and Vardhaman Mahavir Medical College, New Delhi, India. 2. Department of Pathology, National Institute of Pathology, Indian Council of Medical Research, New Delhi, India. 3. Department of Medicine, Safdarjung Hospital and Vardhaman Mahavir Medical College, New Delhi, India.