1. Division of Pharmacoepidemiology and Pharmacoeconomics Department of Medicine Brigham and Women's Hospital and Harvard Medical School Boston Massachusetts USA
2. Department of Population Medicine Harvard Medical School and Harvard Pilgrim Health Care Institute Boston Massachusetts USA
3. Pfizer Ltd Walton Oaks UK
4. Department of Biomedical and Dental Sciences and Morphofunctional Imaging University of Messina Messina Italy
5. BI X GmbH Boehringer Ingelheim Ingelheim Germany