Received: 20 February 2020
Accepted: 4 May 2020
First Online: 10 July 2020
Ethics approval and consent to participate
: This study was performed with the approval of the Ethics Committee of Tokyo Medical and Dental University, Tokyo, Japan (approval number: 309). Under patient-informed consent, the study was conducted in full accordance with the ethical principles of the Declaration of Helsinki. The study is compliant with the STROBE guidelines.
: Consent to publish was obtained from all applicable parties.
: Yoko Oba, Noriko Tachikawa, Motohiro Munakata, Tsuneji Okada, and Shohei Kasugai declare that they have no competing of interests.