1 Faculty of Behavioral, Management and Social Sciences, Department Psychology, Health and Technology, University of Twente, Drienerloolaan 5, 7522NB, Enschede, The Netherlands. Electronic address: J.J.Rasker@utwente.nl.
2 National Data Bank for Rheumatic Diseases, University of Kansas School of Medicine, Wichita, KS.
3 Forward, The National Databank for Rheumatic Diseases, University of Nebraska Medical Center, Omaha, NE.
4 Faculty of Behavioral, Management and Social Sciences, Department Psychology, Health and Technology, University of Twente, Drienerloolaan 5, 7522NB, Enschede, The Netherlands.