Received: 1 July 2019
Accepted: 18 October 2019
First Online: 14 January 2020
Ethics approval and consent to participate
: The use of data concerning the patients was approved by the Institutional Ethics Committee at Tokyo Medical Center. Informed consent could not be directly obtained due to the research design. However, information regarding the study was provided through hospital information services in advance.
: Not applicable.
: MM is the program director of Jikei Clinical Research Program for Primary Care, and TH and HW were former trainees of the Jikei Clinical Research Program for Primary Care. TH and HW were former graduate students of The Jikei University Graduate School of Medicine. No other conflict of interests have been declared by the authors.