1 Department of Community Medicine, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences (NEIGRIHMS), Shillong, Meghalaya. Correspondence to: Gajendra Kumar Medhi, Professor and Head, Department of Community Medicine,NEIGRIHMS, Shillong 793018, Meghalaya. [email protected].
2 Department of Pediatrics, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences (NEIGRIHMS), Shillong, Meghalaya.