Address for Correspondence: 17 Boonchai Chaiyasirinroje, B.Sc. 18 1050/1 Satarnpayabarn Rd., Muang District 19 Chiang Rai 57000, Thailand 20 Tel: +66-53-713135 21 Fax: +66-53-752448 22 Email: boonchai@tbhiv.org 23 24 Address for other authors: 25 Linwei Wang, M.Sc. Candidate 26 Edmonton Clinic Health Academy 4-051 27 11405 87 Avenue, Edmonton, Alberta, Canada, T6G 1C9 28 Email: linwei1@ualberta...