Funding for this research was provided by:
Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (18K08049)
Text and Data Mining valid from 2020-02-18
Received: 5 November 2019
Accepted: 3 February 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and with approval from the institutional review board of Juntendo University (ID: 17-170), and all patients gave their written informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.