Results of the search
The database searches and handsearching of conference proceedings,
journals, and reference lists resulted in 773 unique citations.
One review author (JB) and a research assistant examined the titles
and abstracts and identified 101 reports as potentially relevant,
which were retrieved for further assessment. These were then independently
screened by one review author (JB) and a research
assistant.
Thirty-six references reporting on 30 trialswere included in this review
(see Characteristics of included studies).Where necessary, we
contacted chief investigators to obtain additional information on
trial details and data. Two ongoing trials were identified (Hunter
2010; O’Brien 2010) and these will be considered in future updates
of this review.