1. Ministry of Health, Vientiane, Lao People’s Democratic Republic.
2. Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-shi, Ibaraki-ken 305-8577, Japan.
3. St. Marianna University School of Medicine, Kawasaki, Japan.
4. Public Health Institute, Vientiane, Lao People’s Democratic Republic.