Freehand Endoscopic Fistulotomy Guided by Perineal Ultrasound in Crohn's Perianal Abscess: A Day-Care Alternative to Surgery Allowing Continuation of Biologics - Pal, Partha; Mateen, Mohammad Abdul; Gupta, Rajesh; Tandan, Manu; Reddy, Duvvuru Nageshwar (Journal of Digestive Endoscopy, 2025)