Natphopsuk, Sitakan, Wannapa Settheetham-Ishida, Supat Sinawat, Chamsai Pientong, and Pissamai Yuenyao. 2013. “Passive Smoking Is an Independent Risk Factor for Cervical Cancer in Northeast Thai Women”. Srinagarind Medical Journal 25 (3):215-22. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/12923.