Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fcc4887/MediaObjects/13054_2006_Article_4410_Fig1_HTML.jpg)
Quorum flow diagram summarizing trial flow and reasons for exclusion of studies. PDT, percutaneous dilatational tracheostomy; RCT, randomized clinical trial.
Quorum flow diagram summarizing trial flow and reasons for exclusion of studies. PDT, percutaneous dilatational tracheostomy; RCT, randomized clinical trial.