Jindawong, Nucharin, Kiratikorn Vongvaivanich, Chakorn Chansakul, Paweena Lertakyamanee, Thitaree Yongprawat, Laksamee Jarrat, and Arunrat Pokum. “A 14 Weeks Prospective Pilot Study of the Headache Registry Program at Bangkok Hospital Medical Center”. The Bangkok Medical Journal 7, no. 1 (February 20, 2014): 20. Accessed August 9, 2020. https://he02.tci-thaijo.org/index.php/bkkmedj/article/view/218730.