1. Basel Pharmacoepidemiology Unit, Division of Clinical Pharmacy and Epidemiology, Department of Pharmaceutical Sciences, University of Basel, Switzerland, and Hospital Pharmacy, University Hospital Basel, Switzerland
2. University Hospital Basel, Switzerland
3. Department of Health Sciences, Helsana Insurance Group, Zurich, Switzerland
4. Boston Collaborative Drug Surveillance Program, Boston University School of Public Health, Lexington, MA, USA
5. Basel Pharmacoepidemiology Unit, Division of Clinical Pharmacy and Epidemiology, Department of Pharmaceutical Sciences, University of Basel, Switzerland; Hospital Pharmacy, University Hospital Basel, Switzerland; Boston Collaborative Drug Surveillance Pro