[1] Chiang Mai Univ, Fac Associated Med Sci, Dept Med Technol, PHPT,IRD UMI 174, Chiang Mai 50000, Thailand
[2] IRD, UMI 174, Marseilles, France
[3] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA
[4] Bhumibol Adulyadej Hosp, Bangkok, Thailand
[5] Nakornping Hosp, Chiang Mai, Thailand
[6] Lamphun Prov Hosp, Lamphun, Thailand
[7] Hlth Promot Hosp Reg Ctr I, Bangkok, Thailand
[8] Somdej Pranangchao Sirikit Hosp, Chon Buri, Thailand
[9] Buddhachinaraj Hosp, Phitsanulok, Thailand
[10] Chonburi Reg Hosp, Chon Buri, Thailand
[11] Mae Sai Hosp, Mae Sai, Chiang Rai, Thailand
[12] Hat Yai Hosp, Hat Yai, Songkla, Thailand