Investigator sites and study period
MAY
The following facilities/hospitals participated in this study: University of Occupational and Environmental Health, Japan, Saitama Medical University, Hyogo Medical University School of Medicine, Toho University, Keio University School of Medicine and Kitasato University School of Medicine. This study was conducted between May 2014 and April 2022 (subject incorporation started on 27 August 2014, and the last case was incorporated on 20 February 2020).