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Usefulness of ultrasound in the assessment of the efficacy of apremilast in psoriatic arthritis: Articular, enthesitic and nail index Juan José de Agustin, Gustavo Adolfo Añez, Delia Reina, Sergi Heredia, Julio Ramirez, Andrea Mireya Cuervo, Jesus Rodriguez, Carmen Moragues, Patricia Moya, Ana Maria Laiz Alonso, Mireia Moreno, Marta Arevalo, Manel Pujol, Georgina Salvador, Noemi Busquets, Andres Ponce, Maria Pascual Pastor