- Correspondence Dr Karin Modig, Unit of Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Box 210 Stockholm SE-171 76, Sweden;
- Received 26 May 2016
- Revised 4 October 2016
- Accepted 15 November 2016
- Published online 10 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.