Recurrence and incidence of fistula after urgent drainage of an anal abscess. Long-term results Carlos Chaveli Díaz; Irene Esquiroz Lizaur; Inés Eguaras Córdoba; Gregorio González Álvarez; Ana Calvo Benito; Fabiola Oteiza Martínez; Mario de Miguel Velasco; Miguel Ángel Ciga Lozano;