1. Denmark takes lead on research ethics;Goldbeck-Wood;BMJ,1998
2. Research ethics committees and public dissemination of clinical trial results;Mann;Lancet,2002
3. How important is publication bias? A synthesis of available data;Dickersin;AIDS Educ Prev,1997
4. How important are comprehensive literature searches and the assessment of trial quality in systematic reviews? Empirical study;Egger;Health Technol Asses,2003
5. Using systematic reviews and registers of ongoing trials for scientific and ethical trial design, monitoring, and reporting;Chalmers,2001