1. Division of Toxicology; Department of Pathology; Faculty of Medicine Ramathibodi Hospital; Mahidol University; Rama VI Road Bangkok 10400 Thailand
2. Ramathibodi Poison Center; Faculty of Medicine Ramathibodi Hospital; Mahidol University; Rama VI Road Bangkok 10400 Thailand
3. Department of Emergency Medicine; Faculty of Medicine Ramathibodi Hospital; Mahidol University; Rama VI Road Bangkok 10400 Thailand
4. Division of Clinical Pharmacology and Toxicology; Department of Medicine; Faculty of Medicine Ramathibodi Hospital; Mahidol University; Rama VI Road Bangkok 10400 Thailand