Funding for this research was provided by:
Japan Labour Health and Welfare Organization
Ministry of Health, Labor and Welfare, Japan
Text and Data Mining valid from 2019-04-25
Received: 18 May 2018
Accepted: 9 April 2019
First Online: 25 April 2019
Ethical approval and consent to participate
: This study was approved by the institutional review board of Okayama Rosai Hospital (approval no. 2017–22). This study was also approved by the institutional review board of each hospital or institution that distributed the questionnaire to their patients, according to their policy. The study was conducted based on the ethical principles of avoiding harm, voluntary participation, anonymity, and protection of privacy and personal information. The purpose, procedures, and confidentiality of the study were explained in written format. The participants were informed that nonparticipation would not disadvantage them. Return of the answered questionnaire was considered to constitute the patient’s consent.
: Not applicable.
: The authors declare that they have no competing interests.
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