7L'abbe K A, Detsks S J. Can meta-analysis be trusted[ J]. Lancet, 1991,338 : 1127.
8Jadad A R, Moore A, Carrol D, et al. Assessing the quality of re-ports of randomized clinical trials : Is blinding necessary [ J ]. Control ClinicalTrials, 1996,17 ( 1 ) : 1 - 12.