[1] Univ Texas Hlth Sci Ctr San Antonio, Dept Med, San Antonio, TX 78229 USA
[2] Audie Murphy Hosp, S Texas Vet Hlth Care Syst, San Antonio, TX USA
[3] SW Fdn Biomed Res, SW Natl Reg Primate Ctr, Dept Genet, San Antonio, TX 78284 USA
[4] Univ Texas Hlth Sci Ctr San Antonio, Dept OB GYN, Ctr Pregnancy & Newborn Res, San Antonio, TX 78229 USA