[1] Royal Infirm, Edinburgh Unit, Natl Poisons Informat Serv, Edinburgh, Midlothian, Scotland
[2] City Hosp, Natl Poisons Informat Serv, Birmingham Unit, Birmingham, W Midlands, England
[3] Reg Drug & Therapeut Ctr, Newcastle Unit, Natl Poisons Informat Serv, Newcastle, England
[4] Univ Hosp Llandough, Cardiff Unit, Natl Poisons Informat Serv, Cardiff, S Glam, Wales