Bussaratid, Sontuss, and Apinya Siripiboonkij. 2013. “Study of Smoking Cessation Rate at Smoking Cessation Clinic, Siriraj Hospital, Thailand”. Journal of the Psychiatric Association of Thailand 57 (3):305-12. https://he01.tci-thaijo.org/index.php/JPAT/article/view/6028.