Brewer, Hannah Rose, Hirst, Yasemin ORCID: 0000-0002-0167-9428, Sundar, Sudha, Chadeau-Hyam, Marc and Flanagan, James M (2020) Cancer Loyalty Card Study (CLOCS): protocol for an observational case-control study focusing on the patient interval in ovarian cancer diagnosis. BMJ Open, 10 (9).