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Methodological Challenges When Comparing Demographic and Clinical Characteristics of International Observational Registries.

Verstappen SM, Askling J, Berglind N, Franzen S, Frisell T, Garwood C, Greenberg JD, Holmqvist M, Horne L, Lampl K, Michaud K, Nyberg F, Pappas DA, Reed G, Symmons DP, Tanaka E, Tran TN, Yamanaka H, Ho M. Methodological Challenges When Comparing Demographic and Clinical Characteristics of International Observational Registries. Arthritis Care Res (Hoboken). 2015 Dec; 67(12):1637-45.

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