title: When is "final"?
authors.forename: T W
authors.initials: TW
authors.lastname: Perkins
authors.forename: M
authors.initials: M
authors.lastname: Fisher
mesh_terms: D018463:Filtering Surgery; D005901:Glaucoma / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D015993:Life Tables; D018465:Molteno Implants