1. Preclinical Pharmacology; National Institutes of Health; National Institute on Drug Abuse; Intramural Research Program; Baltimore MD USA
2. RTI International; Research Triangle Park NC USA
3. Drug and Chemical Evaluation Section; Office of Diversion Control; Drug Enforcement Administration; Springfield VA USA
4. Medicinal Chemistry Section; National Institutes of Health; National Institute on Drug Abuse; Intramural Research Program; Baltimore MD USA