Received: 30 April 2019
Accepted: 14 August 2019
First Online: 20 August 2019
Ethics approval and consent to participate
: Our investigation was carried out according to the Declaration of Helsinki. All experimental procedures after 2013 were approved as No. 4038 by the Osaka City University ethics committee, and all patients had provided written informed consent for collection and analysis of the specimens. On the other hand, because the other experimental procedures up to 2013 were only all-inclusive consent, we are showing opt-out form as an observational study.
: Not applicable
: The authors declare that they have no competing interests.