1. University Hospital; Department for Rheumatology, Clinical Immunology, and Allergology; Inselspital Bern Switzerland
2. University of Bern; Division of Clinical Epidemiology and Biostatistics, Institute of Social and Preventive Medicine; Finkenhubelweg 11 Bern Switzerland 3012
3. University of Bern; Institute of Social and Preventive Medicine; Finkenhubelweg 11 Bern Switzerland CH-3012