1. A measure to aid in the interpretation of published clinical trials;Begg;Stat Med,1985
2. The evaluation of negative epidemiologic studies: the importance of all available evidence in risk characterization;Buffler;Regul Toxicol Pharmacol,1989
3. Is selective reporting of clinical research unethical as well as unscientific;Cleophas;Int J Clin Pharamacol Ther,1999
4. The existence of publication bias and risk factors for its occurrence;Dickersin;JAMA,1990
5. How important is publication bias? A synthesis of available data;Dickersin;AIDS Educ Prev,1997