- Correspondence to Dr Thomas Niederkrotenthaler, Department of General Practice and Family Medicine, Center for Public Health, Medical University of Vienna, Severingasse 9, A-1090 Vienna, Austria;
- Accepted March 15, 2012
- First published April 21, 2012.
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.