研究单位：[1]Mundipharma (China) Pharmaceutical Co. Ltd[2]Beijing friendship hospital[3]Beijing Tiantan Hospital[4]Beijing Union hospital[5]Tongji Hospital Wuhan, China
研究目的：
To determine the improvement in symptoms of constipation in subjects receiving treatment with oxycodone/naloxone prolonged release tablets (OXN) compared to oxycodone prolonged release tablets (OXY) based on the Bowel Function Index (BFI)
