Study	Reason for exclusion
Duarte 2006	Not a RCT/CCT; case series
Ehrlich 2002	Not a RCT/CCT; questionnaire
Iwanaka 2004	Not a RCT/CCT; retrospective cohort
Kelleher 2013	Not a RCT/CCT; retrospective study
Malek 2010	Not a RCT/CCT; retrospective chart review
Shanberg 2006	Not a RCT/CCT; letter to the editor regarding case reports
Stanford 2002	Not a RCT/CCT; retrospective cohort study
Wu 2013	Not a RCT/CCT; retrospective study; adult patients

RCT: randomised controlled trial; CCT: controlled clinical trial