1. Laparoscopic surgery in the treatment of Crohn's disease
2. RevMan User Guideline. Review Manager (RevMan) [Computer program] Version 4.2 for Windows. Oxford, England: The Cochrane Collaboration 2002.
3. The Cochrane Collaboration Open Learning Material. Module 15. The Cochrane Collaboration 2002. Available at: http://www.cochrane-net.org/openlearning/HTML/mod15-3.htm . Accessed 1 June 2006.
4. Bias in meta-analysis detected by a simple, graphical test