[1] Triemli Hosp, Dept Med, Zurich, Switzerland
[2] Rheumaklin Wiesbaden II, Wiesbaden, Germany
[3] Gesundheitszentrum Sued, Vienna, Austria
[4] Evang Jung Stilling Krankenhaus, Siegen, Germany
[5] Krankenhaus Frankfurt, Med Clin Nordwest, Frankfurt, Germany
[6] Clin Bayreuth, Inst Pathol F, Bayreuth, Germany
[7] CHUV, Lausanne, Switzerland