Evaluation of novel serological markers for early diagnosis of colorectal neoplasia

Interventions: Group 1: Observational study: Participants in the colorectal cancer screening program, who undergo colonoscopy and a serological examination. Primary outcome(s): sensitivity and specificity of the three serological tests at predefined cutpoints with colonoscopy as gold standard for ascertainment of colorectal neoplasia Study Design: Allocation: ; Masking: ; Control: ; Assignment: ; Study design purpose: diagnostic