Article History
Received: 1 May 2019
Revised: 28 June 2019
Accepted: 10 July 2019
First Online: 1 August 2019
Compliance with ethical standards
: This study was conducted in compliance with the Ethical Guidelines for Medical and Health Research Involving Human Subjects of Japan under the Declaration of Helsinki. The Ethics Committee of the institution approved the protocol and consent forms (approval number: YH-RA-201803). Patients and their families were informed that personal information would be anonymous and used only for analysis before they signed the consent forms.
: None.