Received: 18 June 2020
Accepted: 20 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: The institutional review boards of Kyoto Prefectural University of Medicine (ERB-C-991) and all the participating hospitals approved the protocol. Written informed consent was obtained from all patients before registration in accordance with the Declaration of Helsinki. The results of the study will be disseminated via publication in peer-reviewed journals.
: Not applicable.
: The authors declare that they have no competing interests.