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Wagner T, Toft BG, Engvad B, et al. Prognostic factors for relapse in patients with clinical stage I testicular cancer: protocol for a Danish nationwide cohort study. BMJ Open 2019;9:e033713. doi: 10.1136/bmjopen-2019-033713.
A section of ‘Introduction’ has been duplicated in the published version. The same has been removed and corrected.
