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The statement of the authors on the relevance of volume for treatment quality in CC (a), RC (b), and CRC (c) are depicted as ‘pro’ (green), ‘maybe’ (yellow), or ‘contra’ (red) for hospital volume (HV) or surgeon volume (SV). The sizes of the circles are representative for the number of patients analyzed in the cited papers. The paper cited is given as the reference number (from the reference list) within the circles: n1 > 100,000, n2 = 10,000-100,000, and n3 < 10,000.
