1. Fistula-in-ano in a defined population;Sainio;Ann Chir Gynaecol,1984
2. Fistula-in-ano is usually simple to manage surgically;Shouler;Int J Colorectal Dis,1986
3. Fistula in ano;Thomson;Int J Colorectal Dis,1986
4. A classification of fistula-in-ano;Parks;Br J Surg,1976
5. Advance of ano-rectal surgery with special reference to ambulatory treatment;Eisenhammer;S Afr Med J,1954