[1] Univ Texas Hlth Sci, Ctr San Antonio, Dept Med, San Antonio, TX 78229 USA
[2] South Texas Vet Hlth Care Syst, Dept Vet Affairs, San Antonio, TX 78229 USA
[3] Univ Texas San Antonio, Dept Mech Engn, San Antonio, TX 78249 USA
[4] Univ Texas Hlth Sci, Ctr San Antonio, Dept Epidemiol & Biostat, San Antonio, TX 78229 USA
[5] Univ Environm & Appl Sci UDCA, Dept Anat, Bogota, Colombia
[6] Univ Republica, Fac Vet Med, Dept Anat, Montevideo 11200, Uruguay