Study	Reason for exclusion
Chan 2007	Women in trial did not have CIN confirmed by biopsy.
Cruickshank 2005	Trial does not report outcome measures as specified in protocol.
Foden‐Shroff 1998	133 women had negative CIN histology, 5 had stage Ia carcinoma and 1 had adenocarcinoma in situ out of 500 women in the trial.
Harper 1997	This study was not an RCT.
Paraskevaidis 2001	Quasi‐randomised trial, "One hundred one consecutive women ... were assigned alternately to two groups... as groups were assigned alternatively".
Paraskevaidis 2002	No comparison of relevant interventions.
Stefanidis 1998	Quasi‐randomised trial, "Patients were randomly allocated to one of two groups according to the date of the procedure (odd date group A, even date group B)".