TY - JOUR AU - Sumiyama, K; Gostout, C J; Rajan, E TI - Submucosal endoscopy with mucosal flap safety valve JO - Gastrointest Endosc VL - 65 PY - 2007 DO - 10.1016/j.gie.2006.07.030 SP - 688 EP - 694 N1 - et al. ER -