1. Basel Pharmacoepidemiology Unit, Division of Clinical Pharmacology and Toxicology, University Hospital, Basel, Switzerland
2. AstraZeneca Research and Development, Södertälje, Sweden
3. AstraZeneca Research and Development, Mölndal, Sweden
4. Institute of Medicine, Sahlgrenska Academy, Göteborg University, Göteborg, Sweden
5. Boston Collaborative Drug Surveillance Program, Boston University Medical Center, Lexington, Massachusetts