[1] Tan Tock Seng Hosp, Emergency Dept, Singapore, Singapore
[2] Guys & St Thomas NHS Fdn Trust, Clin Toxicol, London, England
[3] Kings Hlth Partners, London, England
[4] Kings Coll London, Fac Life Sci & Med, London, England
[5] Rocky Mt Poison & Drug Ctr, Denver, CO USA