- Correspondence to Professor Masao Ichikawa, Department of Global Public Health, University of Tsukuba, Tsukuba 305-8577, Japan;
- Received February 25, 2021
- Revised April 12, 2021
- Accepted April 24, 2021
- First published May 24, 2021.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.