<qa>  What is the most commonly used technology in Canada?Over the past decade, evidence from RCT studies and a recent Cochrane systematic review in BMJ demonstrated that venous leg ulcers treated with compression therapy are more likely to heal. Multi-layer high compression systems are more effective than low compression. However, the small number of people in trials comparing different high compression systems meant the review was unable to draw conclusions about their relative merit. Four of these trials have compared 4-layer bandage with short stretch technologies--the most commonly used technologies in Canada. In total, these trials involved only 220 patients, and were thus underpowered. Furthermore, they did not consider factors such as client preference and ease of use, or incorporate an economic evaluation. 