1. Basel Pharmacoepidemiology Unit, Division of Clinical Pharmacy and Epidemiology, Department of Pharmaceutical Sciences, University of Basel, Switzerland
/ Hospital Pharmacy, University Hospital Basel, Switzerland
2. Institute of Pharmaceutical Medicine (ECPM), University of Basel, Switzerland
3. Department of Health Sciences, Helsana Group, Zurich, Switzerland
4. 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 Program, Lexington, MA, USA