1. Department of Community Medicine and Epidemiology; Lady Davis Carmel Medical Center; Haifa Israel
2. Drug Safety Group, Office of Clinical Pharmacology; US Food and Drug Administration; Silver Spring Maryland USA
3. Department of Neurology; Lady Davis Carmel Medical Center; Haifa Israel
4. Statistics Unit; Lady Davis Carmel Medical Center; Haifa Israel
5. Ruth and Bruce Rappaport Faculty of Medicine; Technion-Israel Institute of Technology; Haifa Israel
6. Office of Chief Physician; Clalit Health Services; Tel Aviv Israel