Selection of studies
Independently, two review authors will review titles and abstracts
identified through the search process. We will retrieve full reports
of all potentially relevant trials for further assessment of eligibility
based on the inclusion criteria. Any differences in opinion will
be resolved by discussion with a third review author. The first
two review authors will also assess, independently, all full text
reports against the inclusion criteria; those reports not meeting the
inclusion criteria at this stage will be added to the table of excluded
studies with full reasons for their exclusion noted.