1. 1. Horie S. [History of occupational health physician and industrial safety and health law]. J UOEH. 2013; 35 (Special_Issue) (suppl): 1-26. in Japanese.
2. 2. e-GOV Law Search (Ministry of Internal Affairs and Communications). Industrial Safety and Health Act. https://elaws.e-gov.go.jp/document?lawid=347AC0000000057. Published 2020. Accessed April 8, 2021 (in Japanese).
3. 3. Ministry of Internal Affairs and Communications. 2019 Economic Census - Basic Survey. https://www.stat.go.jp/data/e-census/2019/kekka.html. Published 2020. Accessed April 8, 2021 (in Japanese).
4. 4. Policy Law System Committee and Small- and Medium-sized Enterprise Safety and Health Study Group Caretaker Association, Japan Society for Occupational Health. To Protect the Health and Safety of People Working in SMEs - Formal recommendations for governments, related organizations, and professionals. Sangyo Eiseigaku Zasshi. 2017; 59: A108-A124. in Japanese.
5. 5. Labor Standards Bureau Notification No. 0801010 in. Guidelines for Comprehensive Safety and Health Management by Principal Employers in the Manufacturing Industry; 2006. (in Japanese)