Study	Reason for exclusion
Andrews 1994	Treatment not uniform
Arvas 2005	Treatment not uniform
Ayhan 1988	Treatment not uniform
Burger 1996	Not possible to analyse patients with early vulvar cancer separately
Farias‐Eisner 1994	Treatment not uniform
Grimshaw 1993	Not possible to analyse patients with early vulvar cancer separately
Hacker 1981	Not possible to analyse patients with early vulvar cancer separately
Heaps 1990	Not possible to analyse patients with early vulvar cancer separately
Helm 1992	Not possible to analyse patients with early vulvar cancer separately
Hoffman 1992	Treatment groups did not receive same treatment apart from experimental intervention
Siller 1995	Impossibility to analyse the patients with early vulvar cancer separately
Stehman 1992a	Treatment groups did not receive same treatment apart from experimental intervention