Study	Reason for exclusion
Barbat‐Artigas 2011	Not an RCT
Brown 1995	No outcomes of interest
Frishman 2009	Not an RCT
Gemmell 2006	Short‐term follow‐up (6 weeks)
Jin 1992	Short‐term follow‐up (1 hour)
Li 2012	No outcomes of interest and not relevant population
Mao 2006	Short‐term follow‐up (8 weeks)
Nedelijkovic 2012	No outcomes of interest
Sattin 2005	No outcomes of interest
Song 2003	No outcomes of interest
Thumwaree 2011	Short‐term follow‐up (8 weeks)
Wayne 2010	No outcomes of interest
Wu 2010	Control group not minimal

RCT: randomised controlled trial.