1. National Centre for Healthcare Research and Pharmacoepidemiology Milan Italy
2. Laboratory of Healthcare Research and Pharmacoepidemiology Department of Statistics and Quantitative Methods University of Milano‐Bicocca Milan Italy
3. Department of Clinical Medicine and Community Health Università degli Studi di Milano Milano Italy
4. Department of Medical and Surgical Sciences University of Bologna Bologna Italy
5. Stony Brook Cancer Center Stony Brook University Stony Brook New York USA