Brewer, Hannah R, Hirst, Yasemin ORCID: 0000-0002-0167-9428, Chadeau-Hyam, Marc, Johnson, Eric, Sundar, Sudha and Flanagan, James M (2023) Association Between Purchase of Over-the-Counter Medications and Ovarian Cancer Diagnosis in the Cancer Loyalty Card Study (CLOCS): Observational Case-Control Study. JMIR Public Health and Surveillance, 9 .