1. Department of Emergency Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan;
2. College of Medicine, Chang Gung University, Taoyuan, Taiwan;
3. San Francisco Division, California Poison Control System, San Francisco, CA, USA;
4. Department of Laboratory Medicine, University of California, San Francisco, CA, USA;
5. Department of Emergency Medicine, University of California, San Francisco, CA, USA.