[1] WAKE FOREST UNIV, BOWMAN GRAY SCH MED, DEPT BIOCHEM, WINSTON SALEM, NC 27103 USA
[2] WAKE FOREST UNIV, BOWMAN GRAY SCH MED, DEPT MED, WINSTON SALEM, NC 27103 USA
[3] DUKE UNIV, MED CTR, DEPT PEDIAT, DURHAM, NC 27710 USA
[4] UNIV ALABAMA, MED CTR, DEPT PEDIAT, BIRMINGHAM, AL 35233 USA
[5] UNIV ALABAMA, MED CTR, DEPT MICROBIOL, BIRMINGHAM, AL 35233 USA