Sweden

Anders Ekbom

Karolinska Institutet, Karolinska University Hospital Solna, Department of Medicine, Stockholm, Sweden.

F Bresso

Center for Digestive Diseases, Department of Gastroenterology, Dermatology, and Rheumatology, Karolinska University Hospital, Stockholm, Sweden.; Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.

Johan Askling

Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.; Rheumatology, Theme Inflammation and Ageing, Karolinska University Hospital, Stockholm, Sweden.

Robert Lofberg