The UK Haemophilia Centre Doctors' Organisation National Haemophilia Database was collated over time from patient records. Linked evidence WITN3826016 - NHD and UKHCDO - 'Bleeding disorder statistics for the Infected Blood Inquiry 2020; 01 September 2022 Chronology Information Date: 1 January 1960 1 September 2022 Chapter/issue Cover up: Medical Records