Study	Reason for exclusion
Aghai 2006	Observational (before‐after) study, not a randomised controlled trial
Al Qurashi 2008	Observational (before‐after) study, not a randomised controlled trial
Aziz 2010	Observational (before‐after) study, not a randomised controlled trial
Bertini 2005	Observational (before‐after) study, not a randomised controlled trial
Dutta 2005	Observational (before‐after) study, not a randomised controlled trial
Healy 2005	Observational (before‐after) study, not a randomised controlled trial
Healy 2008	Observational (before‐after) study, not a randomised controlled trial
Kim 2008	Observational (before‐after) study, not a randomised controlled trial
Maede 2013	Observational (before‐after) study, not a randomised controlled trial
Manzoni 2006	Observational (before‐after) study, not a randomised controlled trial
Manzoni 2008	Observational (before‐after) study, not a randomised controlled trial
McCrossan 2007	Observational (before‐after) study, not a randomised controlled trial
Rueda 2010	Observational (before‐after) study, not a randomised controlled trial
Uko 2006	Observational (before‐after) study, not a randomised controlled trial
Wadhawan 2007	Observational (before‐after) study, not a randomised controlled trial
Weitkamp 2008	Observational (before‐after) study, not a randomised controlled trial