- Correspondence to Mary R Rooney, Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN 55454, USA;
- Received June 6, 2018
- Revised October 8, 2018
- Accepted October 15, 2018
- First published October 30, 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.