**5. Abbreviations**

Ab, antibody; ALD, aldolase; ANA, anti-nuclear antibody; anti-SSA Ab, anti- Sjögren's syndrome A Ab; anti-SSB Ab, anti- Sjögren's syndrome B Ab; CK, creatine kinase; D-E junction, dermo-epidermal junction; DM, dermatomyositis; IL, interleukin; NSAID, nonsteroidal anti-inflammatory drug; pSjS, primary Sjögren's syndrome; PSL, prednisolone; VAS, visual analog scale; WNL, within normal limit
