[1] Khon Kaen Univ, Fac Nursing, Res & Training Ctr Enhancing Qual Life Working Ag, 123 Mittrapab Rd, Khon Kaen 40002, Khon Kaen Provi, Thailand
[2] Mahidol Univ, Fac Publ Hlth, Salaya, Thailand
[3] Khon Kaen Univ, Fac Med, 123 Mittrapab Rd, Khon Kaen 40002, Khon Kaen Provi, Thailand
[4] Sirindhorn Coll Publ Hlth, Khon Kaen, Thailand
[5] Khon Kaen Univ, Fac Pharmaceut Sci, 123 Mittrapab Rd, Khon Kaen 40002, Khon Kaen Provi, Thailand
[6] Minist Publ Hlth, Off Dis Prevent & Control Reg 6, Khon Kaen, Thailand