Assam State AIDS Control Society (SACS), Guwahati, India;
Silchar Medical College & Hospital, Silchar, India;
Assam Medical College & Hospital, Dibrugarh, India;
Regional Institute of Medical Sciences, Imphal, India;
Part-Time Project Consultant, Kolkata, India;
ICMR-National Institute of Cholera & Enteric Diseases, Kolkata, India;