Efficacy of amoxicillin/clavulanic acid after surgical drainage of perianal abscess in the prevention of the development of anal fistula (PERIQxA study): study protocol for a multi... oleh Verónica Polaino Moreno, Antonio F. Caballero-Bermejo, Mariano Artés Caselles, Javier Serrano González, Xabier Remírez Arriaga, Natalia González Alcolea, Aritz Equisoain Azcona, Eva Iglesias García, José Luis Lucena de la Poza, Arsenio Sánchez Movilla, Belén Ruiz-Antorán, PERIQxA Study Group