Left-sided primary tumors are associated with favorable prognosis in patients with KRAS codon 12/13 wild-type metastatic colorectal cancer treated with cetuximab plus chemotherapy: an analysis of the AIO KRK-0104 trialJobst C. von Einem, Dominik Paul Modest, Sebastian Stintzing et al.|Journal of Cancer Research and Clinical Oncology|2014Cited by 112