1. Research School of Population Health, Australian National University, Canberra, Australia
2. Royal Centre for Disease Control, Ministry of Health, Thimphu, Bhutan
3. Ministry of Health, Thimphu, Bhutan
4. Faculty of Health Sciences, Curtin University, Perth, Australia
5. Wesfarmers Centre of Vaccines and Infectious Diseases, Telethon Kids Institute, Nedlands, Australia