1. PMDA (2005) https://www.pmda.go.jp/english/about-pmda/outline/0002.html. Accessed 22 Mar 2021
2. Ministry of Internal Affairs and Communications (MIC) (1960) https://elaws.e-gov.go.jp/document?lawid=335AC0000000145 (Japanese). Accessed 22 Mar 2021
3. Ministry of Health, Labour and Welfare (MHLW) (1961) https://www.mhlw.go.jp/web/t_doc?dataId=81006000&dataType=0&pageNo=1 (Japanese). Accessed 22 Mar 2021
4. Ministry of Health, Labour and Welfare (MHLW) (1993) https://www.mhlw.go.jp/web/t_doc?dataId=00ta6846&dataType=1&pageNo=1 (Japanese). Accessed 22 Mar 2021
5. Ministry of Health, Labour and Welfare (MHLW) (1999) https://www.mhlw.go.jp/shingi/2005/01/dl/s0124-9h1.pdf (Japanese). Accessed 22 Mar 2021