Endoscopic ultrasound-guided drainage of abdominal abscesses and infected necrosis - Seewald, S.; Ang, T. L.; Teng, K. Y. K.; Groth, S.; Zhong, Y.; Richter, H.; Imazu, H.; Omar, S.; Polese, L.; Seitz, U.; Bertschinger, P.; Altorfer, J.; Soehendra, N. (Endoscopy, 2009)