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Multicenter phase II study of second-line bevacizumab plus doublet combination chemotherapy in patients with metastatic colorectal cancer progressed after upfront bevacizumab plus doublet combination chemotherapyYong Sang Hong, Jeeyun Lee, Kyu-pyo Kim, Jae-Lyun Lee, Young Suk Park, Joon Oh Park, Se Hoon Park, Sun Young Kim, Ji Yeon Baek, Jee Hyun Kim, Keun-Wook Lee, Tae-You Kim, Tae Won Kim · 2013