- Correspondence to Dr Wiley D Jenkins, Office of Population Scienceand Policy, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
- Received January 26, 2018
- Revised July 11, 2018
- Accepted July 24, 2018
- First published August 27, 2018.
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.