1. Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina
2. Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio
3. Reproductive Endocrine Unit, Massachusetts General Hospital, Boston, Massachusetts
4. Endocrine Sciences, Laboratory Corp, Calabasas Hills, California
5. ZRT Laboratory, Beaverton, Oregon
6. Social & Scientific Systems, Inc., Durham, North Carolina
7. Biostatistics & Computational Biology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina