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Article History

Received: 11 June 2018

Accepted: 29 October 2018

First Online: 4 December 2018

Ethics approval and consent to participate

: The ethics committee of Tsuyama Jifukai Tsuyama Chuo Hospital provided the approval to conduct the research presented in this paper. Anonymized patient data was provided for this research. Patient consent regarding the use of anonymized data for research purposes were acquired by the hospital.

: Not applicable.

: The author received a salary as an employee of Allm Inc.

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