1. Health Search; Italian College of General Practitioners; Florence Italy
2. Centre for Clinical Epidemiology; Lady Davis Institute, Jewish General Hospital; Montreal Quebec Canada
3. Department of Oncology; McGill University; Montreal Quebec Canada
4. Institute for Drug Research; School of Pharmacy, Hebrew University; Jerusalem Israel
5. Department of NEUROFARBA; Section of Pharmacology and Toxicology, University of Florence; Florence Italy
6. Department of Epidemiology; Biostatistics and Occupational Health, McGill University; Montreal Quebec Canada