Hypovitaminosis D in recent onset rheumatoid arthritis is predictive of reduced response to treatment and increased disease activity: a 12 month follow-up study

¹ Rheumatology Unit-Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Viale del Policlinico 155, Rome 00161, Italy

² Internal Medicine Unit-Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Viale del Policlinico 155, Rome 00161, Italy

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