Department of Gastroenterology and Hepatology;
University Hospital of Zurich;
Zurich 8091;
Switzerland;
Visceral-and Transplant Surgery;
University Hospital of Zurich;
Zurich 8091;
Switzerland;
Department of Surgery;
Zeller Surgery;
Zurich 8008;
Switzerland;
Department of Gastroenterology;
University Hospital of Zurich;
Zurich 8091;
Switzerland;
Visceral Surgery and Medicine;
University Hospital of Bern;
Bern 3010;
Switzerland;
Fistula; Fibrin glue; Crohn's disease; Perianal disease activity index; Inflammatory bowel disease; Fistula closure;