Funding for this research was provided by:
Japan Cancer Society (0000)
Received: 4 November 2019
Accepted: 10 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: Informed consent was obtained from all participant verbally since the subject was anonymous telephone counseling service. This study and the procedure for verbal consent were approved by the institutional review board of KCC (H27 epidemiology-12).
: Not applicable.
: The authors declare that they have no competing interests.