On board! Rehabilitation after colorectal cancer

Interventions: Group 1: At the begin of rehabilitation (baseline): - self-administered questionnaires (see primary and secondary endpoints for further details) - measurement of height, weight and waist circumference - blood sampling: serum (25(OH)D level, creatinine, calcium, phosphate, albumin, total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides, C-reactive protein, uric acid), whole blood (hemoglobin, HbA1c, white blood cell count, leukocyte subtype counts) and buffy coat from EDTA Plasma (genome) - urine sampling (calcium and creatinine) - stool sampling (microbiome) - pregnancy test for premenopausal women Long-term follow-up: - self-administered questionnaires at study month 4, 7, 10 and after 1, 3, 5, 7, 10 years (see primary and secondary endpoints for further details) - stool sampling in study month 4 (microbiome) Primary outcome(s): - Cancer-related fatigue assessed by using validated questionnaires (FACIT-F and EORTC-QLQ-FA12) in month 4, 7, 10 and after 1, 3, 5, 7, 10 years Study Design: Allocation: ; Masking: ; Control: ; Assignment: ; Study design purpose: prevention