3. Rockey DC: Occult and obscure gastrointestinal bleeding: causes and clinical management. Nat Rev Gastroenterol Hepatol 7: 265-279, 2010
4. Teshima CW, Kuipers EJ, van Zanten SV et al: Dou-ble balloon enteroscopy and capsule endoscopy for obscure gastrointestinal bleeding: an updated meta- analysis. J Gastroenterol Hepatol 26: 796-801, 2011
5. Yano T, Yamamoto H, Sunada K et al: Endoscopic classification of vascular lesions of the small intes-tine (with videos). Gastrointest Endosc 67: 169-172, 2008