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Websites
- Division of Cardiovascular R, and Neurological Devices, Center for Devices, and Radiological Health, Food and Drug Administration. Draft replacement heart valve guidance, version 4.1. www.fda.gov/cdrh/ode/3751 (1994). Accessed 20/09/2003.
- Society of Thoracic Surgeons homepage. List of variables involved in STS risk modelling. www.sts.org/file/VariableList.pdf. Accessed 20/09/2003.