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Subclinical synovitis and tenosynovitis by ultrasonography (US) 7 score in patients with rheumatoid arthritis treated with synthetic drugs, in clinical remission by DAS28 Lucio Ventura-Ríos, Guadalupe Sánchez Bringas, Cristina Hernández-Díaz, Esteban Cruz-Arenas, Rubén Burgos-Vargas