Fluoroscopy Time Required for Each Step of Interventional Endoscopic Ultrasonography - Masafumi Watanabe; Kosuke Okuwaki; Mitsuhiro Kida; Hiroshi Imaizumi; Kai Adachi; Akihiro Tamaki; Taro Hanaoka; Daisuke Ogawa; Chika Kusano (Journal of Digestive Endoscopy)