About the Authors

Karl Michaëlsson

To whom correspondence should be addressed. E-mail: Karl.Michaelsson@surgsci.uu.se

Affiliations Section of Orthopaedics, Department of Surgical Sciences, University Hospital, Uppsala, Sweden , Uppsala Clinical Research Center, University Hospital, Uppsala, Sweden

Helena Olofsson

Affiliation Section of Orthopaedics, Department of Surgical Sciences, University Hospital, Uppsala, Sweden

Karin Jensevik

Affiliation Uppsala Clinical Research Center, University Hospital, Uppsala, Sweden

Sune Larsson

Affiliation Section of Orthopaedics, Department of Surgical Sciences, University Hospital, Uppsala, Sweden

Hans Mallmin

Affiliation Section of Orthopaedics, Department of Surgical Sciences, University Hospital, Uppsala, Sweden

Lars Berglund

Affiliation Uppsala Clinical Research Center, University Hospital, Uppsala, Sweden

Bengt Vessby

Affiliation Section of Geriatrics, Department of Public Health, University Hospital, Uppsala, Sweden

Håkan Melhus

Affiliation Section of Clinical Pharmacology, Department of Medical Sciences, University Hospital, Uppsala, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Karl Michaëlsson, Helena Olofsson, and Håkan Melhus designed the study. Karl Michaëlsson, Bengt Vessby, and Hans Mallmin acquired the data. Karl Michaëlsson, Karin Jensevik, and Lars Berglund performed the statistical analysis. Karl Michaëlsson drafted the manuscript, which was critically revised by all coauthors.