- Correspondence to Taulant Muka, Department of Epidemiology, Erasmus Medical Center, Dr. Molewaterplein 50, Room NA2914, P.O. Box 2040, Rotterdam 3000 CA, The Netherlands;
- Received August 26, 2015
- Revised January 4, 2016
- Accepted February 7, 2016
- First published February 25, 2016.
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.