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Authors
Ritsuno, Yoshihiro
Kawado, Miyuki
Morita, Mitsuhiro
Yamada, Harumoto
Kanaji, Arihiko
Nakamura, Masaya
Matsumoto, Morio
Hashimoto, Shuji
Fujita, Nobuyuki
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Article History
Received: 22 January 2021
Accepted: 22 July 2021
First Online: 6 August 2021
Declarations
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: Data from all three surveys were used with the approval of the Ministry of Health, Labour and Welfare of Japan, and the Ministry of Internal Affairs and Communications.
: Not applicable.
: The authors declare that they have no competing.
