CD8 and CD4 lymphocyte subsets, their soluble receptors (sCD8, sCD4) and interleukine-2 soluble receptor (sIL2r) in polymyalgia rheumatica (PMR). A comparison between two steroid treatment (prednisone, PDN and deflazacort, DFZ) and with elderly-onset (EoRA) and adult-onset (AoRA) rheumatoid arthritis in a retrospective study.