Study	Reason for exclusion
Berchtold 1992	There was no appropriate control group.
Bilo 2009	There was no appropriate control group.
Bousquet 1987	This was not a trial of venom immunotherapy.
Brockow 1997	There was no appropriate control group.
Brown 2008	There was no appropriate control group.
Divanovic 1997	There was no appropriate control group.
Malling 1985	This was not a randomised controlled trial.
Mosbech 1986	There was no appropriate control group.
Muller 1985	There was no appropriate control group.
Muller 1987	There was no appropriate control group.
Muller 1992	This was not a randomised controlled trial.
Muller 2001	There was no appropriate control group.
Muller 2008	There was no appropriate control group.
Ohman 1986	This was not a randomised controlled trial.
Quercia 2001	There was no appropriate control group.
Reimers 2000	There was no appropriate control group.
Roumana 2009	There was no appropriate control group.
Spertini 2000	This was not a randomised controlled trial.
Thurnheer 1983	There was no appropriate control group.
Wohrl 2007	There was no appropriate control group.
Zubrinich 2010	This was not a randomised controlled trial.