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Hwang J, Ahn JK, Lee J, Koh EM, Cha HS.  Rheumatoid Factor Positivity is Associated with Lower Bone Mass in Korean Male Health Examinees without Clinically Apparent Arthritis.  J Rheum Dis 2019;26:31-40.  https://doi.org/10.4078/jrd.2019.26.1.31