- Correspondence to Dr Lindsay R Pool, Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, 680 North Lake Shore, Suite 1400, Chicago, Illinois 60611, USA;
- Received 7 September 2016
- Revised 1 February 2017
- Accepted 27 March 2017
- Published online 17 April 2017.
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.