1. Quality of life (Time Frame - 9-15 days after surgery): Quality of life is assessed with EORTC QLQ-30 and EORTC QLQ-CR 29 at baseline, 9-15 days after surgery and 4 weeks after surgery. An improvement in Arm A is characterized by 10 points
2. Quality of Life (Time Frame - 4 weeks after surgery): Quality of life is assessed with EORTC QLQ-30 and EORTC QLQ-CR 29 at baseline, 9-15 days after surgery and 4 weeks after surgery. An improvement in Arm A is characterized by 10 points
Secondary outcome:
1. Period of hospitalization (Time Frame - 9-15 days after surgery, 4 weeks after surgery)
2. Complication rates (Time Frame - 9-15 days after surgery, 4 weeks after surgery)
Experimental: Krankenhaus Nordwest Concept specific preoperative education program realised by a specialized stoma-therapist containing individualized information on material maintenance, hygiene, nutrition, complications, activities of daily life and occupation
Experimental: Standard concept standard preoperative education program administered by a surgeon containing information on surgery, outcome, risks and alternatives