1. McLean Hospital (H.G.P.), Harvard Medical School, Belmont, Massachusetts 02478;
2. University of Southern California (R.I.W.), Los Angeles, California 90089;
3. University of Virginia (A.R.), Charlottesville, Virginia 22904;
4. Department of Pharmaceutical Biosciences, (F.N.), Upsala University, SE-751 24, Upsala, Sweden;
5. United States Anti-Doping Agency (L.B.), Colorado Springs, Colorado 80919;
6. Brigham and Women's Hospital (S.B.), Harvard Medical School, Boston, Massachusetts 02115