1. Neurological Surgery PC; Lake Success New York U.S.A
2. Albert Einstein College of Medicine; Bronx New York U.S.A
3. G.H. Sergievsky Center and Department of Neurology; College of Physicians & Surgeons; New York New York U.S.A
4. Department of Epidemiology; Mailman School of Public Health; Columbia University; New York New York U.S.A
5. Division of Epidemiology; New York State Psychiatric Institute; New York New York U.S.A
6. Consultant; Houston Texas U.S.A
7. Vedanta Research; Chapel Hill North Carolina U.S.A