1. Department of Human Ecology; The University of Tokyo; Tokyo 113-0033 Japan
2. Department of Health Promotion; Tokyo Medical and Dental University; Tokyo 113-0034 Japan
3. Faculty of Nursing; The Japanese Red Cross Akita College of Nursing; Akita 010-1493 Japan
4. Niigata University of Pharmacy and Applied Life Sciences; Niigata 956-8603 Japan
5. Faculty of Letter; Chiba University; Chiba 263-8522 Japan
6. Tokyo Metropolitan University; Tokyo 192-0397 Japan
7. Faculty of International Resource Sciences; Akita University; Akita 010-8502 Japan
8. Department of International Health; Nagasaki University; Nagasaki 852-8523 Japan
9. Papua New Guinea Institute of Medical Research; Goroka EHP 441 Papua New Guinea
10. School of Applied and Biomedical Sciences; Federation University; Churchill Campus Victoria 3841 Australia
11. Infection and Immunity Division; The Walter and Eliza Hall Institute of Medical Research; Melbourne Victoria 3052 Australia