6Sackett DL, Clarke M, OxmanAD, et al. Cochrane reviewers, handbook 42,in renew manager[M]. Versions4.2. Oxford,England:Thecochranecollaboration, 2002 : 13-36.
7Jadad AR, Moore A, Carroll D, et al. Assessing the quality of reports of randomized clinical trials :is blinding necessary [J ]. Control ClinTrials, 1996,17 (i) : 1-12.
8Tonelli MR. The limits of evidence based medicine [J ]. Respir Care, 2001,46(12) : 1435-1440.
9Matthias E, George DS, Martin S, et al. Bias in meta-analysis detectedbya simple, graphical Test [ J ]. British Medical Journal, 1998,315 ( 14 ) : 629-634.
10Derrick AB ,Nancy KL,Caroline S ,et al. Anderson Capture-recapture is a potentially useful methodf or assessing publication Bias [J].Journal of Clinical Epidemiology, 2004,57 (3) : 349-357.
