TABLE 1. Exclusion criteria for trials and literature reviews.

Trials	Literature reviews
Lack of randomisation Drop-out rate >33%	Focus on population or intervention not clearly stated in title and abstract
Patients and clinicians not 'blinded' where possible and appropriate	Article methodology describes no clear inclusion and exclusion criteria for reviewed publications
No baseline data provided for both the control and the study group	Article methodology describes no clear search strategy, key words and databases used and includes no study-by-study critique table or discussion of study qualities
	Baseline differences not statistically adjusted
	Clinically important outcomes for patients not assessed.