Hanioka, Takashi, Satoru Haresaku, Nao Suzuki, Kaoru Shimada, Takeshi Watanabe, Miki Ojima, Keiko Fujiie, and Masako Watanabe. “A Natural Experiment for Inferring Causal Association Between Smoking and Tooth Loss: A Study of a Workplace Contemporary Cohort”. International Journal of Statistics in Medical Research 4, no. 4 (November 2, 2015): 331–336. Accessed November 21, 2024. https://lifescienceglobal.com/pms/index.php/ijsmr/article/view/3226.