About the Authors

Tsjitske M. Haanstra

t.haanstra@vumc.nl

Affiliation Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, The Netherlands

Claire Tilbury

Affiliation Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

Steven J. Kamper

Affiliations Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, The Netherlands, Musculoskeletal Division, The George Institute for Global Health, The University of Sydney, Sydney, New South Wales, Australia

Rutger L. Tordoir

Affiliation Department of Orthopaedics, Rijnland Ziekenhuis, Leiderdorp, The Netherlands

Thea P. M. Vliet Vlieland

Affiliation Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

Rob G. H. H. Nelissen

Affiliation Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

Pim Cuijpers

Affiliation Department of Clinical Psychology and the EMGO Institute for Health and Care Research, VU University Amsterdam, The Netherlands

Henrica C. W. de Vet

Affiliation Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, The Netherlands

Joost Dekker

Affiliation Department of Rehabilitation Medicine and the EMGO Institute, VU University Medical Centre, Amsterdam, The Netherlands

Dirk L. Knol

Affiliation Department of Epidemiology and Biostatistics, VU University Medical Centre, Amsterdam, The Netherlands

Raymond W. Ostelo

Affiliations Department of Epidemiology and Biostatistics and the EMGO Institute for Health and Care Research, VU University Medical Centre, Amsterdam, The Netherlands, Department of Health Sciences and the EMGO Institute for Health and Care Research, VU University, Amsterdam, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TMH CT SJK PC HCWdV JD DLK RWO. Performed the experiments: TMH CT RLT TPMVV RGHHN. Analyzed the data: TMH CT SJK DLK RWO. Contributed reagents/materials/analysis tools: TMH CT RLT TPMVV RGHHN. Wrote the paper: TMH CT SJK TPMVV RGHHN PC HCWdV JD DLK RWO.