- Correspondence to Ms Erica M Lokken, Department of Epidemiology, University of Washington, Seattle, WA 98102, USA;
- Received July 13, 2018
- Revised December 6, 2018
- Accepted January 4, 2019
- First published January 29, 2019.
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.