Experience after implementation of ultrasound-guided synovial biopsy in a Rheumatology Department Carlos Antonio Guillén-Astete; Boris Blanco Cáceres; Jaime Arroyo Palomo; Aliuska Malena Palomeque Vargas; Marta Serrano Warleta; Ana María Ruiz Bejerano; Ana Sánchez-Poves García; Javier Bachiller Corral; Mónica Vázquez-Díaz;