1. Department of Epidemiology, University of Michigan, Ann Arbor, MI, USA
2. Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh, Indonesia
3. Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh, Indonesia
4. Department of Microbiology, School of Medicine, Universitas Syiah Kuala, Banda Aceh, Indonesia
5. Department of Economics, Faculty of Accountancy and Management, Universiti Tunku Abdul Rahman, Kajang, Malaysia
6. Department of Epidemiology, Ministry of Education Key Laboratory of Public Health Safety, Fudan University School of Public Health, Shanghai, China