1. University of California, Davis (L.B.), Sacramento, California 95817
2. University of Washington (J.D.B.), Seattle, Washington 98195
3. Washington University School of Medicine (A.C.G.), St. Louis, Missouri 63110
4. Columbia University (I.J.G.), New York, New York 10027
5. Harvard School of Public Health (F.S.), Boston, Massachusetts 02115
6. Mayo Clinic (M.H.M.), Rochester, Minnesota 55905
7. Radboud University Nijmegen Medical Centre (A.F.H.S.), 6525 GA Nijmegen, The Netherlands