1. 1. Notice by the Director of the Labor Standards Bureau (No. 0907-2, September 7, 2018) (in Japanese). https://www.mhlw.go.jp/content/000465065.pdf. Published 2018. Accessed July 20, 2020.
2. 2. Notice by the Director of the Labor Standards Bureau (No.0329-02, March 29, 2019) (in Japanese). https://www.mhlw.go.jp/content/000507330.pdf. Published 2019. Accessed July 20, 2020.
3. 3. Overview of Certified Occupational Physicians by Year (Total number of certified occupational physicians). Japan Medical Association (in Japanese). http://dl.med.or.jp/dl-med/teireikaiken/20181205_2.pdf. Published 2018. Accessed July 20, 2020.
4. 4. Mori K, Nagata M, Hiraoka M, Kudo M, Nagata T, Kajiki S. Surveys on the competencies of specialist occupational physicians and effective methods for acquisition of competencies in Japan. J Occup Health. 2015; 57(2): 126-141.
5. 5. Moriguchi J, Kajiki S, Furuki K, et al. A survey on company information that occupational physicians should be aware of in Kyoto Prefecture Medical Association (in Japanese). Sangyo Eiseigaku Zasshi 2017; 59 (supplementary volume): 369.