Funding for this research was provided by:
Japan Society for the Promotion of Science (18K18199, 16H01781)
Ministry of the Environment (5-1652)
Text and Data Mining valid from 2019-04-04
Received: 12 December 2018
Accepted: 26 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: Informed consent was obtained from the participants. This study was approved by the Biomedical Research Ethics Committee of the Graduate School of Medicine, Chiba University (ID 451: 8 November 2013; ID 849: 27 March 2018).
: The authors declare that they have no conflicts of interest.