1. Department of Medical Informatics; Erasmus Medical Center; Rotterdam The Netherlands
2. Department of Clinical and Experimental Medicine and Pharmacology, Section of Pharmacology; University of Messina; Messina Italy
3. Agenzia Regionale di Sanità della Toscana; Florence Italy
4. PHARMO Institute; Utrecht The Netherlands
5. Division of Primary Care, School of Community Health Sciences; University of Nottingham; UK
6. Società Italiana di Medicina Generale; Florence Italy
7. Pedianet-Società Servizi Telematici SRL; Padova Italy
8. Department of Statistics; Università di Milano-Bicocca; Milan Italy
9. Department of Clinical Epidemiology; Aarhus University Hospital; Aarhus Denmark
10. Department of Epidemiology; Erasmus Medical Center; Rotterdam The Netherlands