[1] So Iron Disorders Ctr, Birmingham, AL USA
[2] Univ Alabama, Dept Microbiol, Birmingham, AL 35294 USA
[3] Univ Alabama, Dept Med, Birmingham, AL 35294 USA
[4] Wake Forest Univ, Bowman Gray Sch Med, Dept Publ Hlth Sci, Winston Salem, NC 27103 USA
[5] Univ Western Ontario, London, ON, Canada
[6] Univ Calif Irvine, Dept Med, Irvine, CA 92717 USA
[7] Kaiser Permanente, Ctr Hlth Res, Portland, OR USA
[8] London Hlth Sci Ctr, Dept Med, London, ON, Canada
[9] Howard Univ, Dept Med, Washington, DC 20059 USA