1. Department of Clinical Rheumatology and Immunology, University Hospital in Krakow, Krakow, Poland.
2. National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland.
3. Department of Internal Medicine N2, Danylo Halytsky Lviv National Medical University, Lviv, Ukraine.
4. Departments of Rheumatology and Research and Development, Dudley Group NHS Foundation Trust (Teaching Trust of the University of Birmingham, UK), Russells Hall Hospital, Dudley, UK.