Table 1. Summary of studies included in the analysis.

Study	Multicentre	Type of transplant	Geographic origin	Data source	Number of pantients	Number of renal transplant cases
Birkeland et al, 2000	Yes	Renal	Denmark	Danish registry	1821	1821
Cheung et al, 2012	Yes	Renal	China	Hong Kong Renal Registry	4674	4895
Collett et al, 2010	Yes	Multiorgan	UK	UK Transplant Registry	25 104	25 104
Hoshida et al, 1997	Yes	Renal	Japan	Multicentre, Japan	1744	1744
Krynitz et al, 2013	Yes	Multiorgan	Sweden	Swedish National Patient Register	7952	7952
Kyllonen et al, 2000	No	Renal	Finland	Finland Transplant Registry	2890	3440
Li et al, 2012	Yes	Renal	China	Taiwan National Health Insurance Research Database (NHIRD)	4716	4716
Piselli et al, 2013	Yes	Renal	Italy	Italian KT centre	7217	7299
Vajdic et al, 2006	Yes	Renal	Australia and New Zealand	Australia and New Zealand Dialysis and Transplant Registry (ANZDATA)	10 180	10 180
Vegso et al, 2007	No	Renal	Hungary	Budapest transplantation center	2535	2852
Villeneuve et al, 2007	Yes	Renal	Canada	Canadian Organ Replacement Registry	11 155	11 391
Total					79 988	81 394