1. Vanderbilt University Medical Center; Nashville Tennessee U.S.A.
2. University of Tennessee Health Science Center and LeBonheur Children's Hospital; Memphis Tennessee U.S.A.
3. Midwest Center for Seizure Disorders; Minneapolis Clinic of Neurology; Golden Valley Minnesota U.S.A.
4. Pfizer, Inc.; New York New York U.S.A.
5. Pfizer, Inc.; Cary North Carolina U.S.A.
6. Meridian Medical Technologies, Inc.; Columbia Maryland U.S.A.
7. Duke University Medical Center; Cary North Carolina U.S.A.