1. Central Department of Public Health, Institute of Medicine, Tribhuvan University, Kathmandu, Nepal
2. Department of Community Medicine, Institute of Medicine, Tribhuvan University, Kathmandu, Nepal
3. Department of ENT, Tribhuvan University Teaching Hospital, Kathmandu, Nepal
4. Dhulikhel Hospital, Research and Development Department, Dhulikhel, Kavrepalanchok, Nepal