TY - JOUR T1 - Two cheers for meta-analysis: problems and opportunities in aggregating results of clinical trials JF - Canadian Medical Association Journal JO - CMAJ SP - 891 LP - 895 VL - 138 IS - 10 AU - C. D. Naylor Y1 - 1988/05/15 UR - http://www.cmaj.ca/content/138/10/891.abstract ER -