Fig 1.

Study flowchart. Criteria for excluding centres were fewer than 50 patients recruited, non-consecutive recruitment, or insufficient quality of follow-up data (appendix 3). Eleven of 20 oncology centres and 8 of 16 non-oncology centres were excluded. Supplementary table 1 gives details of excluded centres. IOTA5=International Ovarian Tumour Analysis phase 5 study