doi:10.1017/S1368980011001224, Published online by Cambridge University Press 23 June 2011
In the published article the author affiliation 1 is incorrect.
1Department of Clinical Epidemiology, Preventive Medicine and Public Health and Cardiovascular Research & Development Unity, University of Porto Medical School, Alameda Prof. Hernani Monteiro, 4200-319 Porto, Portugal
It should be as follows:
1Department of Clinical Epidemiology, Predictive Medicine and Public Health and Cardiovascular Research & Development Unity, University of Porto Medical School, Alameda Prof. Hernani Monteiro, 4200-319 Porto, Portugal
The publishers apologise for this error.