1. Faculty of Health and Medical Sciences , School of Public Health, , Adelaide, SA 5000 , Australia
2. University of Adelaide , School of Public Health, , Adelaide, SA 5000 , Australia
3. Faculty of Medicine , Nursing and Health Sciences, School of Nursing and Midwifery, ,Victoria 3800, Australia
4. Monash University , Nursing and Health Sciences, School of Nursing and Midwifery, ,Victoria 3800, Australia
5. Department of Microbiology , Public Health Research Laboratory, Institute of Medicine, , Kathmandu 44600 , Nepal
6. Tribhuvan University Teaching Hospital , Public Health Research Laboratory, Institute of Medicine, , Kathmandu 44600 , Nepal
7. Departments of Community Health Sciences and Epidemiology, Fielding School of Public Health, University of California Los Angeles (UCLA) , Los Angeles, CA 90095 , USA
8. Department of Research, Nepal Health Research Council , Kathmandu 44600 , Nepal