1. Department of Clinical Epidemiology and Biostatistics, Academic Medical Center—University of Amsterdam, 1100 DE Amsterdam, The Netherlands
2. Department of Pathology, University of Virginia, Charlottesville, VA 22903
3. Clinical Chemistry, Washington, DC 20037
4. Centre for Statistical Sciences, Brown University, Providence, RI 02912
5. Centre for General Practice, University of Queensland, Herston QLD 4006, Australia
6. Department of Public Health & Community Medicine, University of Sydney, Sydney NSW 2006, Australia
7. Chalmers Research Group, Ottowa, Ontario, K1N 6M4 Canada
8. Institute for Health Policy Studies, University of California, San Francisco, San Francisco, CA 94118
9. Journal of the American Medical Association, Chicago, IL 60610
10. Institute for Research in Extramural Medicine, Free University, 1081 BT Amsterdam, The Netherlands