Study	Reason for exclusion
Ambresin 2002	Retrospective non‐randomised trial
Carassa 2003	The trial investigators took an end point when the procedure failed, using the last IOP reading before surgical revision or addition of medication forwards to compare with other studies. This is a severe form of incomplete outcome data.
Chiselita 2001	Different criteria for success from the inclusion criteria of this review. The study used a drop in IOP of 30% compared to preoperative level as a cut‐off point for success versus failure.
Cillino 2008	It is a retrospective analysis of the same group of participants as in Cillino 2005 but with data assessed at 48 months. The data from Cillino 2005 at 12 months of follow‐up are already included in the review.
Fukuchi 2001	Minimum follow‐up was too short: 3 months
Gandolfi 2005	Conference report with not enough details for analysis and no further publication of the study
Gilmour 2009	The primary outcome of the surgery was assessed at a point of 18 mmHg (not 21 mmHg), and the minimum follow‐up period was 6 months (not 12 months)
Huo 2008	No randomisation is mentioned in the study and it is more like a case study of control and observational groups with no actual randomisation
Jonescu‐Cuypers 2001	The follow‐up period was 6 to 8 months only which does not meet the inclusion criteria for the review
Lachkar 2001	Conference report with not enough details for analysis and no further publication of the study
Leszczynski 2012	The study design is a prospective controlled study and not a RCT. The investigators used a very deep sclerectomy technique (which is different from the standard deep sclerectomy surgical technique) as they excised the entire thickness of the sclera during their procedure
Luke 2001	Conference report with not enough details for analysis and no further publication of the study
Mermoud 1999	Non‐randomised trial
O'Brart 2001	Conference report with not enough details for analysis and no further publication of the study
Schwenn 2004	Assessment was only mean values, no report on success and failure rates which are not modes on analysis in the methodology of this study
Spinelli 2000	Excluded as supplement 232 for this journal does not appear to exist
Yarangümeli 2005	The trial investigators included cases with angle‐closure glaucoma
Yuan 2007	The investigators used non‐contact Topcon CT80 tonometer to measure intraocular pressure and did not use contact tonometry in all cases. They did not use a standard viscocanalostomy surgical technique but used a modified one