unselected hand radiographs from 37 primary sjogren 's syndrome patients ( pss ) , 19 patients with rheumatoid arthritis ( ra ) and sjogren 's syndrome ( secondary ss ) and 29 patients with ra only were evaluated blind by osteoradiologists , using reference radiographs for scoring joint space narrowing and erosion at the proximal interphalangeal joints , the metacarpophalangeal joints and the wrists .
C0151449
primary sjogren 's syndrome
C1527336
sjogren 's syndrome