[1] Univ Basel, Pharmaceut Sci, Basel, Switzerland
[2] Univ Zurich, Swiss Toxicol Informat Ctr, Zurich, Switzerland
[3] Univ Basel Hosp, Dept Neurol, CH-4031 Basel, Switzerland
[4] Boston Univ, Sch Publ Hlth, Boston Collaborat Drug Surveillance Program, Boston, MA USA
[5] Univ Hosp Bern, Div Gen Internal Med, CH-3010 Bern, Switzerland