1. 1) The Tokyo Organizing Committee of the Olympic and Paralympic Games. https://tokyo2020.org/en/ (Cited 25 April 2019).
2. 2) Alles S: Special Events and Mass Gatherings: A Preparedness Perspective. http://nacchopreparedness.org/special-events-and-mass-gatherings-a-preparedness-perspective/ (Cited 25 April 2019)
3. 3) Kawamori R: Roles of sportology for the prevention of diabetes mellitus. Nihon Rinsho, 2012; 70 Suppl 5: 653-658. (in Japanese)
4. 4) Daida H: The 3rd Congress, International Academy of Sportology, 2017. http://www.c-linkage.co.jp/3ias/message.html (Cited 25 April 2019)
5. 5) Kollek D: An Introduction to Mass Gatherings, 2014. http://www.ceep.ca/publications/Mass_Gatherings.pdf (Cited 25 April 2019)