1. Istituti Clinici Zucchi, Monza, Italy
2. National Centre for Healthcare Research and Pharmacoepidemiology, Milan, Italy
3. Laboratory of Healthcare Research and Pharmacoepidemiology, Department of Statistics and Quantitative Methods, University of Milano Bicocca, Milan, Italy
4. Laboratory of Clinical Pharmacology and Pharmacoepidemiology, Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy