[1] Univ Calif Davis, Davis Med Ctr, Dept Pharmaceut Serv, Sacramento, CA 95817 USA
[2] Univ Calif Davis, Sch Med, Sacramento, CA 95817 USA
[3] Univ Calif San Francisco, Sch Pharm, San Francisco, CA 94143 USA
[4] Univ Calif Davis, Davis Med Ctr, Anticoagulat Serv, Sacramento, CA 95817 USA