Pilot study of transesophageal endoscopic epicardial coagulation by submucosal endoscopy with the mucosal flap safety valve technique (with videos). - Sumiyama K; Gostout CJ; Rajan E; Bakken TA; Knipschield MA; Chung S; Cotton PB; Hawes RH; Kalloo AN; Kantsevoy SV; Pasricha PJ (Gastrointestinal endoscopy, 2008)