5Higgins JPT,Green S. Cochrane handbook for systematic reviews of inter- ventions. Version 5.0 [ M ]. The Cochrane Collaboration ,2011.
6Jadad AR, Moore RA, Carroll D. Assessing the quality of reports of ran- domized clinical trials: is blinding necessary? [ J]. Control Clin Trials, 1996,17(1) :1 - 128.