1. Rheumatology Department, University Hospital Center, 1001 Tirana, Albania
2. Faculty of Technical Medical Sciences, University of Elbasan, 3001 Elbasan, Albania
3. Orthopaedic Department, University Hospital of Ioannina, 451 10 Ioannina, Greece
4. Nephrology Department, University Hospital Center, 1001 Tirana, Albania