Vipra Mangla1, M P Cariappa2, Ratnesh Shukla3. 1. DADH, HQ 12 Rapid, C/O 56 APO, India. 2. Associate Professor, Dept of Community Medicine, Armed Forces Medical College, Pune 40, India. 3. Graded Specialist (Anaesthesia), Military Hospital Jodhpur, C/O 56 APO, India.