3[2]Jadad AR, Moore A, Carroll D,et al. Assessing the quality of reports of randomized clinical trails: Is blinding necessary[J]. Control Clin Trials, 1996, 17(1): 1-12.
4[3]Clarke M, Oxman AD,editors. Cochrane Reviewers' Handbook[M]. 4.2.0 [updated March 2003].In: The Cochrane Library, Issue 2,2003. Oxford:Update Software.Updated quarterly.
6[14]Vickers A, Goyal N, Harland R, et al. Do certain countries produce only postive results? A systematic review of controlled trials[J].Control Clin Trials, 1998,19(2)∶159-166.