[1] Univ Calif San Francisco, Dept Emergency Med, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Calif Poison Control Syst San Francisco Div, San Francisco, CA 94143 USA
[3] Kaiser San Leandro Fremont, Dept Emergency Med, San Leandro, CA USA
[4] Univ Calif San Francisco, Dept Lab Med, San Francisco, CA 94143 USA
[5] Univ Calif San Francisco, Dept Med, San Francisco, CA USA