The effectiveness of self-management intervention program for the management of bowel symptoms after shincter preserving surgery in rectal cancer patients

intervention group:self management intervention program for bowel symptoms after SPS;Control group:routine care Primary outcome(s): Low anterior resection syndrone;Memorial Sloan-Kettering Cancer Center Bowel Function Questionnaire;bowel symptom self-management behavior;Quality of life;self efficacy in bowel symptom management Study Design: Randomized parallel controlled trial