3Derrick A, Nancy K L, Caroline S, et al. Anderson capture-recapture is a potentially useful method for assessing publication bias [J ]. Journal of Clini cal Epi demiology, 2004,57 ( 3 ) : 349.
4Sackett D L, Clarke M, Oxman A D, et al. Cochrane reviewers, hand- book 4.2, in renew manager [ M ]. Versions 4.2.Oxford, England :The cochrane collaboration, 2002:13.
5Jadad A R, Moore A, Carroll D, et al. Assessing the quality of reports of randomized clinical trims : is blinding necessary [ J ]. Control C lin Trials, 1996,17( 1 ) : 1.
6Matthias E ,George D S ,Martin S ,et al. Bias in meta-analysis detected by a simple,graphical test[J]. British Medical Journal, 1998,315(12) : 629.
