[1] Scottish Poisons Informat Bur, NPIS Edinburgh, Edinburgh, Midlothian, Scotland
[2] Reg Drug & Therapeut Ctr, NPIS Newcastle, Newcastle Upon Tyne, Tyne & Wear, England
[3] Univ Hosp Llandough, NPIS Cardiff, Cardiff, S Glam, Wales
[4] City Hosp, NPIS Birmingham, Birmingham, W Midlands, England