1 Institute for Behavior and Health, Inc., 6191 Executive Blvd, Rockville, MD 20852. Electronic address: bobdupont@aol.com.
2 National Institute on Drug Abuse, 6001 Executive Blvd, Rockville, Maryland 20852. Electronic address: wcompton@nida.nih.gov.
3 Treatment Research Institute, 600 Public Ledger Building, 150 S. Independence Mall West, Philadelphia, PA 19106. Electronic address: TMcLellan@tresearch.org.