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Perez-Ruiz F, Hernandez-Baldizon S, Herrero-Beites AM, Gonzalez-Gay MA.Perez-Ruiz F, et al.Arthritis Care Res (Hoboken). 2010 Sep;62(9):1299-305. doi: 10.1002/acr.20221.Arthritis Care Res (Hoboken). 2010.PMID: 20506124Free article.