6Jordan J, Roig JV, Garcia-Armengol J, et al. Risk factors for re- currence and incontinence after anal fistula surgery[ J]. Colorectal Dis, 2010,12 (3) :254-260.
7Perez F, Arroyo A, Serrano P, et al. Prospective clinical and man- ometric study of fistulotomy with primary sphincter reconstruction in the management of recurrent complex fistula-in-ano[ J]. Int J Colo- rectal Dis, 2006,21 (6) :522-526.
8Tchemtchoua VT, Atanasova G, Aqil A, et al. Development of a chitosan nanofibrillar scaffold for skin repair and regeneration [ J ]. Biomacromolecules, 2011,12 (9) :3194-3204.