1. Department of Philosophy and Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada; Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
2. Center for Genetics and Society, Berkeley, California, USA; and Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
3. Department of Community Health and Epidemiology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.