Study of the incidence of osteoporosis in patients with Sjögren's syndrome (pSS) and investigation of activation of the RANKL /RANK and osteoprotegerin (OPG) system

研究干燥综合征（pSS）患者骨质疏松症的发生率，并探讨RANKL/RANK和骨保护素（OPG）系统的激活情况。