[1] Univ Calgary, Microbiol & Infect Dis, Calgary, AB, Canada
[2] Univ Calgary, Chem, Calgary, AB, Canada
[3] Univ Calgary, Biol & Anat, Calgary, AB, Canada
[4] Univ Kentucky, Pharmaceut Sci, Lexington, KY USA
[5] Univ Calif San Francisco, Lab Med, San Francisco, CA 94143 USA