About the Authors

Bart J Emmer

To whom correspondence should be addressed. E-mail: b.j.emmer@lumc.nl

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

Jeroen van der Grond

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

Gerda M Steup-Beekman

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

Tom W. J Huizinga

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

Mark A van Buchem

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

BJE, JvdG, and TWJH designed the study. BJE, JvdG, TWJH, and MAvB analyzed the data. TWJH enrolled patients. BJE, JvdG, GMSB, TWJH, and MAvB contributed to writing the paper. TWJH wrote the grant that covers the salary of the BJE together with MavB.