Global Anal Fistula Treatment Market By Type (Fistulotomy, Seton Techniques, Advancement Flap Procedures, Fibrin Glue, Bioprosthetic Plug, and Other Emerging Techniques), By Application (Extrasphincteric Fistula, Suprasphincteric Fistula, Transphincteric Fistula, Intersphincteric Fistula, and Submucosal Fistula), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029