Phudamrong, Phichet. 2018. “ehavior and arketing ix of elective the nnual asic ealthcare ervices ith rivate ompany in the entral egion rea”. ournal of anagement cience akhon athom ajabhat niversity 4 (1), 33-46. https://doi.org/10.14456/jmsnpru.2017.4.