1. University of Pennsylvania School of Medicine, Room 111, Clinical Research Building, 415 Curie Boulevard, Philadelphia, PA 19104, USA.
2. Department of Psychiatry, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8134, St. Louis, MO 63110, USA.
3. Division of Substance Dependence, Department of Psychiatry, University of Colorado School of Medicine, Campus Box C 268-35, 4200 East 9th Avenue, Denver, CO 80262, USA.
4. VACHS, Yale University School of Medicine, 950 Campbell Avenue, West Haven, CT 06516, USA.
5. National Institute on Drug Abuse, 6001 Executive Boulevard, Bethesda, MD 20892, USA.
6. Division of Human Genetics, Department of Psychiatry, Yale University School of Medicine, VA Medical Center 116A2, West Haven, CT 06516, USA.
7. Institute for Behavioral Genetics, University of Colorado, 1480 30th Street, 447 UCB, Boulder, CO 80309-0447, USA.
8. Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
9. Department of Psychiatry and Medicine, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.
10. Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, 15 North 2030 East, Salt Lake City, UT 84108, USA.
11. Program in Genomics and Bioinformatics on Drug Addiction, Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, MSC 7792, San Antonio, TX 78229, USA.
12. Department of Psychiatry, University of Michigan, 475 Market Place, Suite L, Ann Arbor, MI 48109-0757, USA.
13. SRI International, Center for Health Science, 333 Ravenswood Avenue, Menlo Park, CA 94025-3493, USA.
14. Department of Genetics, Rutgers University, Nelson Biological Laboratories, 604 Allison Road, Piscataway, NJ 08854-8082, USA.
15. Department of Psychiatry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0603, USA.
16. Johns Hopkins School of Medicine, 5500 Nathan Shock Drive, Baltimore, MD 21224, USA.
17. University of Pittsburgh, Pittsburgh, PA 15261, USA.
18. Division of Cancer Control and Population Sciences, National Cancer Institute, 6130 Executive Boulevard, Executive Plaza North, Rockville, MD 20852, USA.