Rajesh Mahajan1, Gunchan Paul2, Puneet Chopra2, Pooja Suri3. 1. Department of Medicine, Dayanand Medical College and Hospital, Ludhiana, India. 2. Critical Care Division, Dayanand Medical College and Hospital, Ludhiana, India. 3. Department of Microbiology, Dayanand Medical College and Hospital, Ludhiana, India. E-mail: gunchan@gmail.com.