1. National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand.
2. Department of Internal Medicine, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan.
3. AIDS Research Center, National Institute of Infectious Diseases, Tokyo, Japan.
4. Lampang Hospital, Lampang, Thailand.
5. Department of Immunotherapeutics, Tokyo Medical and Dental University, Tokyo, Japan.