Study	Reason for exclusion
Bacigalupo	Uncontrolled study.
Deeg 1985	Quasi‐randomization was used (alternation)
Doney 1981	The study comparison didn't meet inclusion criteria (Corticosteroids vs Anti‐thymocyte globulin.)
Gilman 2000	Study type is letter and it doesn't contain information about a relevant comparison.
Kanojia 1984	Uncontrolled study.
Michallet 1999	Retrospective analysis.
Oblen 1992	Uncontrolled study.
Prentice 1980	Uncontrolled study.
Srivanasan 2004	Retrospective analysis.
Sullivan 1987	The study comparison didn't meet inclusion criteria (it was prednisolone + placebo vs prednisolone + azathioprine)
Sullivan 1993	The study comparison didn't meet inclusion criteria (it was prednisolone vs alternating day cyclosporine/prednisolone)