1. Departments of Genetics and Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
2. Center for Bioethics, Indiana University, Indianapolis, IN 46202, USA.
3. Health Psychology Section, King's College London, London SE1 9RT, UK.
4. Faculty of Law and School of Public Health, Health Law Institute, University of Alberta, Edmonton, Alberta T6G 2H5, Canada.