Study	Reason for exclusion
Allen 2004	Design: not a randomised controlled trial
Barczak 2001	Design: not a randomised controlled trial
Barron 1985	Design: not a randomised controlled trial
Chalker 1983	Design: not a randomised controlled trial
Clegg 2007	Design: not a randomised controlled trial
Comorosan 1993	Intervention: electromagnetic therapy
Cukjati 2001	Design: not a randomised controlled trial
Edsberg 2002	Design: not useable pilot data
Gault 1976	Design: not a randomised controlled trial
Gentzkow 1993	Design: not a randomised controlled trial
Goldman 2004	Participants: venous ulcers
Houghton 2003	Participants: leg ulcers
Jankovic 2008	Participants: leg ulcers
Jia 2015	Intervention: acupuncture
Karsli 2017	Design: no control group
Koel 2014	Design: not a randomised controlled trial
Lawson 2007	Design: not a randomised controlled trial
Lee 2007	Design: not a randomised controlled trial
Lippert‐Gruner 2003	Design: not a randomised controlled trial
Polak 2014	Design: not a randomised controlled trial
Recio 2012	Design: not a randomised controlled trial
Stefanovska 1993	Design: not a randomised controlled trial
Sugimoto 2012	Intervention: in vitro
Trontelj 1994	Design: not a randomised controlled trial
Ullah 2007	Design: not a randomised controlled trial
Van Londen 2008	Participants: no pressure ulcers
Wolcott 1969	Design: not a randomised controlled trial
Yoshikawa 2015	Intervention: in vitro