[1] Vet Affairs Med Ctr, Minneapolis, MN USA
[2] Univ Minnesota, Dept Med, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Psychiat, Minneapolis, MN 55455 USA
[4] Hlth Sci Ctr, Dept Clin Microbiol, Winnipeg, MB, Canada
[5] Univ Manitoba, Fac Med, Dept Med Microbiol, Winnipeg, MB R3T 2N2, Canada
[6] Hlth Sci Ctr, Dept Med, Winnipeg, MB, Canada