เพ็งทอง เ. factors that are affecting the health-related tourism to foreign tourists of Koh Samui District, Surat Thani Province. ptujournal [Internet]. 2019 Jun. 14 [cited 2024 Apr. 29];11(1):267-7. Available from: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/187782