1. Health Search Italian College of General Practitioners and Primary Care; Florence Italy
2. Department of Health Sciences; University of Florence; Florence Italy
3. Institute for Liver and Digestive Health; Royal Free Hospital; University College of London; London UK
4. Italian College of General Practitioners and Primary Care; Florence Italy
5. Department of Transfusion Medicine; Local Health Authority n°5; Pordenone Italy
6. IMS Health Information Solutions Medical Research srl; Milan Italy