Received: 28 May 2020
Accepted: 19 July 2020
First Online: 25 July 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the ethical guidelines of the 1975 Declaration of Helsinki and was approved by the Ethical Committee of Shinshu University Hospital (approval number: 4471). Informed consent was obtained from each patient using the opt-out method; patients could opt-out at any time on the website. The opt-out method was approved by the Ethical Committee of Shinshu University Hospital.
: Not applicable.
: The authors declare that they have no competing interests.