Natphopsuk, S., W. Settheetham-Ishida, S. Sinawat, C. Pientong, and P. Yuenyao. “Passive Smoking Is an Independent Risk Factor for Cervical Cancer in Northeast Thai Women”. Srinagarind Medical Journal, vol. 25, no. 3, Oct. 2013, pp. 215-22, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/12923.