Observational Cohort Studies in Rheumatic Diseases
Soo-Kyung Cho, Dam Kim, Yoon-Kyoung Sung
Korean J Med. 2014;87(5):548-556.   Published online 2014 Nov 1     DOI: https://doi.org/10.3904/kjm.2014.87.5.548
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A paradigm shift in studies based on rheumatoid arthritis clinical registries
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The Korean Journal of Internal Medicine.2019; 34(5): 974.     CrossRef