Arunmuang, Arunrut. 2021. “Expectation and Satisfaction to Service Quality of Pre - Marketing Control for Health Products and Health Services in Chai Nat Provincial Health Office Towards Government Easy Contact Center (GECC)”. Thai Food and Drug Journal 28 (2). Nonthaburi, Thailand:85-95. https://he01.tci-thaijo.org/index.php/fdajournal/article/view/250327.