1. National Medical Institute of the Ministry of the Interior and Administration, Warsaw, Poland
2. Independent Public Clinical Hospital Named After Prof. W. Orłowski of the Centre of Postgraduate Medical Education, Warsaw, Poland
3. Praski Hospital Sp. z o.o., Warsaw, Poland
4. Military Institute of Medicine – National Research Institute, Warsaw, Poland
5. University Clinical Centre, Medical University of Warsaw, Warsaw, Poland
6. Department of Early Arthritis, The Professor Eleonora Reicher National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland
7. Marshal Jozef Pilsudski Memorial Hospital in Płonsk, Płońsk, Poland