Text and Data Mining valid from 2019-09-10
Received: 23 November 2018
Accepted: 30 August 2019
First Online: 10 September 2019
Ethics approval and consent to participate
: This study was approved by the medical research ethical review board of Gunma University and the institutional review board of each participating institution. Information regarding the purpose and content of the study, study methods, voluntary participation, right to withdraw, protection of personal information, guarantee of anonymity, data storage and deletion methods, as well as the publication of research results, was provided to all participants orally and through a written document. They were told that they would experience no disadvantage in treatment or care for refusing to participate. Consent for participation was obtained from each participant who signed an informed consent form.Ethical Committee For Clinical Studies, Gunma University Faculty of Medicine13–16 (include Red Cross Hospital Ethics and Hidaka Hospital Ethics:2013),The Ethics committee of The Jikei University School of Medicine for Biomedical Research 25–290(7425) and Niigata Prefectural Central Hospital Ethics Review Committee 2013–12.
: Not applicable.
: The authors declare that they have no competing interests.