7Costa L, Lipton A, Coleman RE, et al. Role of bisphosphonates for the management of skeletal complications and bone pain fromskeletal metastases[J]. Support Cancer Ther, 2006, 3(3): 143- 153.
8Riegler G, Esposito I. Bristol scale stool form. A still valid help in medical practice and clinical research[J]. Tech Coloproctol, 2001, 5(3):163-164.
9Plaisance L, Ellis JA. Opioid-induced constipation, management is necessary but prevention is better[J]. Am J Nurs, 2002, 102(3):72-73.
10Swegle JM, Logemann C. Management of common opioid- induced adverse effects[J]. Am Fam Physician, 2006, 74(8): 1347- 1354.