About the Authors

Rudolf Puchner

rudolf.puchner@cc-net.at

Affiliation Rheumatology Practise Dr Puchner, Wels, Austria

Michael Edlinger

Affiliation Department of Medical Statistics, Informatics and Health Economics, Medical University of Innsbruck, Innsbruck, Austria

Erich Mur

Affiliation Department of Internal Medicine I, Medical University of Innsbruck, Innsbruck Austria

Gabriele Eberl

Affiliation Klinikum Malcherhof Baden, Baden bei Wien, Austria

Manfred Herold

Affiliation Department of Internal Medicine I, Medical University of Innsbruck, Innsbruck Austria

Peter Kufner

Affiliation Private Practise Dr Kufner, Innsbruck, Austria

Antonia Puchner

Affiliation Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria

Stephan E. Puchner

Affiliation Department of Orthopaedic Surgery, Medical University of Vienna, Vienna, Austria

Kurt Redlich

Affiliation Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria

Alois Alkin

Affiliation Centre of Excellence in Medicine, Linz, Austria

Klaus Machold

Affiliation Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria

Competing Interests

This project was supported by an unrestricted educational grant to the Austrian Society of Rheumatology and Rehabilitation from Pfizer Austria Grand number: WP387446, www.pfizermed.at. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RP EM KM. Performed the experiments: ME GE MH PK AP SEP KR AA. Analyzed the data: RP ME AA KM. Wrote the paper: RP ME KM.