Surgery	Study ID	Reason for non‐inclusion
Cardiac surgery	Dogan 2016	Data N/A
	Chiu 2008	Too heterogeneous
	Vrooman 2015	Too heterogeneous
Breast cancer surgery	Di‐Gennaro 2013	Data N/A
Plastic surgery of the breast	Bell 2001	Different type of intervention
Iliac crest bone graft	Blumenthal 2005	Data N/A
	O'Neill 2014	Data N/A
Laparotomy	Katz 2004	Too heterogeneous
	Lavand'homme 2005	Too heterogeneous
Caesarean section	O'Neill 2012	No events
Hernia repair	Burney 2004	Data N/A
	Kurmann 2015	Too heterogeneous
	Mounir 2010	Too heterogeneous
	Okur 2016	Data N/A
Prostatectomy	Smaldone 2010	Data N/A
Vasectomy	Paxton 1995	Single study
Limb amputation	Kairaluoma 2006	Inconsistent regional application
	Katsuly‐Liapis1996
	Pinzur 1996	Data N/A
Pectus excavatum	Weber 2007	Single study
Cholecystectomy	Fassoulaki 2016	Single study
Spinal surgery	Xu 2017	Single study
Thyroidectomy	Choi 2016	Single study
Craniotomy	Zhou 2016	Single study