[1] Univ Tennessee, Hlth Sci Ctr, Ophthalmol, Germantown, TN USA
[2] St Jude Childrens Res Hosp, Oncol, 332 N Lauderdale St, Memphis, TN 38105 USA
[3] St Jude Childrens Res Hosp, Surg, 332 N Lauderdale St, Memphis, TN 38105 USA
[4] Univ Tennessee, Ctr Hlth Sci, Microbiol Immunol & Biochem, Memphis, TN 38163 USA