Non-invasive breath testing to detect colorectal cancer: protocol for a multicentre, case–control development and validation study (COBRA2 study) by Michael G. Fadel, James Murray, Georgia Woodfield, Ilaria Belluomo, Ivan Laponogov, Aaron Parker, Valerio Converso, James K. Ellis, Pete Wheatstone, Julie Hepburn, Chris Groves, Kevin Monahan, Brian P. Saunders, Patrik Španěl, Kirill Veselkov, Amanda J. Cross, Christos Kontovounisios, Linda D. Sharples, George B. Hanna, COBRA2 Collaborators

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