B Ekwall1, C Clemedson1, B Crafoord1, B Ekwall1, S Hallander2, E Walum3, I Bondesson4. 1. CTLU, Stånga, Sweden. 2. Swedish National Institute of Forensic Medicine, Lund, Sweden. 3. Pharmacia & Upjohn, Stockholm, Sweden. 4. Swedish Poisons Information Centre, Stockholm, Sweden.