[1] VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT MED,BOX 263,RICHMOND,VA 23298
[2] VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT MICROBIOL & IMMUNOL,RICHMOND,VA 23298
[3] MED UNIV S CAROLINA,DEPT PHARMACOL,CHARLESTON,SC 29425
[4] MED UNIV S CAROLINA,DEPT MED,CHARLESTON,SC 29425