Funding for this research was provided by:
MEXT | Japan Society for the Promotion of Science (16K08862)
Article History
Received: 28 September 2020
Revised: 7 December 2020
Accepted: 11 December 2020
First Online: 25 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The JECS protocol and this adjunct study were approved by the Institutional Review Board on Epidemiological Studies of the Ministry of the Environment and by the Ethics Committees of all participating institutions. These studies were conducted in accordance with the Helsinki Declaration and other nationally valid regulations and guidelines. All persons in the study gave their informed consent prior to their inclusion in the JECS. In the questionnaire of this study, the opportunity to refuse was ensured by stating that the answers to the questionnaire were voluntary