Results at one year of the TROPIS technique in the treatment of complex anal fistula María Luisa Reyes Díaz; Fatima Hinojosa-Ramirez; Irene María Ramallo Solís; Rosa María Jiménez Rodríguez; Jose Pintor Tortolero; Ana María García Cabrera; Jorge M. Vázquez Monchul; Fernando de la Portilla de Juan;