1. Columbia University and New York Presbyterian Hospital (W.C.H.), New York, New York 10032
2. VU Medical Center (P.C-K., H.A.D.-v.d.W.), 1007 MB Amsterdam, The Netherlands
3. Leiden University Medical Center (H.A.D.-v.d.W.), 2300 RC Leiden, The Netherlands
4. Andro-consult (L.J.G.) ChaingMai 50220, Thailand
5. University of Texas Medical Branch (W.J.M.), Galveston, Texas 77555
6. Harvard Medical School (N.P.S.), Boston, Massachusetts 02115
7. Emory University School of Medicine (V.T.), Atlanta, Georgia 30322
8. Mayo Clinic (V.M.M.), Rochester, Minnesota 55905