Yamanashi K, Katsurada T, Nishida M, Onishi R, Omotehara S, Otagiri S, Sakurai K, Nagashima K, Kinoshita K, Takagi R, Sakamoto N. Crohn’s Disease Activity Evaluation by Transabdominal Ultrasonography: Correlation with Double-Balloon Endoscopy. J Ultrasound Med. [Epub ahead of print]