Concurrence of Rheumatoid Arthritis and Ankylosing Spondylitis: Analysis of Seven Cases and Literature Review by Bryan-Josué Flores-Robles, Eztizen Labrador-Sánchez, Estíbaliz Andrés-Trasahedo, Valvanera Pinillos-Aransay, María-Yasmina Joven-Zapata, Laura Torrecilla Lerena, Osman-Alberto Salazar-Asencio, Juan-Antonio López-Martín

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