About the Authors

Klaas A. Hartholt

Affiliations Department of Internal Medicine - Section of Geriatric Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands, Department of Surgery-Traumatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Christian Oudshoorn

Affiliation Department of Internal Medicine - Section of Geriatric Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Stephanie M. Zielinski

Affiliation Department of Surgery-Traumatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Paul T. P. W. Burgers

Affiliation Department of Surgery-Traumatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Martien J. M. Panneman

Affiliation Consumer and Safety Institute, Amsterdam, The Netherlands

Ed F. van Beeck

Affiliation Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Peter Patka

Affiliation Department of Surgery-Traumatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Tischa J. M. van der Cammen

t.vandercammen@erasmusmc.nl

Affiliation Department of Internal Medicine - Section of Geriatric Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands

Competing Interests

A grant from NutsOhra (project number T-0602-43) was received. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: KAH TJMvdC. Performed the experiments: KAH MJMP. Analyzed the data: KAH MJMP CO PP TJMvdC. Contributed reagents/materials/analysis tools: KAH CO SMZ PTPWB. Wrote the paper: KAH CO SMZ PTPWB MJMP EFvB PP TJMvdC. Approved final version: KAH CO SMZ PTPWB MJMP EFvB PP TJMvdC.