Study	Reason for exclusion
Craft 2008	This is not a randomised controlled trial and does not evaluate the prevention of parastomal hernia.
Deol 2003	This is a paper on the repair, not prevention of, parastomal hernias. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Guzman‐Valdivia 2008	This is a paper on the repair of parastomal hernia. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Halabi 2013	This paper is on the repair, not prevention of, parastomal hernias. This is not a randomised controlled trial.
Hamada 2012	This paper compares rates of parastomal herniation in end colostomies in totally extraperitoneal vs transabdominal pre‐peritoneal approach to stomas formation. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Hansson 2007	This is a paper on repair of parastomal hernia. This is not a randomised controlled trial.
Hansson 2009	This is a paper on the repair, not prevention of, parastomal hernias. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Hansson 2012	There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Hiles 2009	This small systematic review demonstrated some evidence for the use of biological mesh in the repair of parastomal hernia, but it is not a randomised controlled trial.
Lee 2014	This is not a randomised controlled trial on the prevention of parastomal hernias.
Linn 2010	This paper evaluates the complications of parastomal hernia repair. This is not a randomised controlled trial.
Mancini 2007	This is a case series of parastomal hernia repairs. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Shah 2013	A collection of different techniques for repair of parastomal hernias and their outcomes. This is not a randomised controlled trial.
Smart 2011	A review of methods of parastomal hernia repair and outcomes. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.
Stephenson 2010	This paper evaluates the repair of parastomal hernia. There is no evidence for the prevention of parastomal herniation. This is not a randomised controlled trial.