Article History
Received: 14 November 2019
Accepted: 8 December 2019
First Online: 18 December 2019
Ethics approval and consent to participate
: This study was approved by the Medical Ethical Committee of the National Hospital Organization Tochigi Medical Center (No. 2019-3). This study was conducted in accordance with the Ethical Guidelines for Epidemiological Research in Japan and was carried out in accordance with the Declaration of Helsinki. The need for individual informed consent was formally waived by the Medical Ethical Committee of the National Hospital Organization Tochigi Medical Center because data were collected without contacting the patients. However, as per Japanese Ethical Guidelines, an opt-out statement was displayed in the waiting room and webpage of the hospitals to inform the study and provide the opportunity to refuse the use of data for the patients.
: Not applicable.
: No one declares financial relationships with any organizations that might have an interest in this submitted work and no other relationships or activities that could appear to have influenced the submitted work.