[1] Univ New Mexico, Dept Obstet & Gynecol, Hlth Sci Ctr, Albuquerque, NM 87131 USA
[2] Univ New Mexico, Hlth Sci Ctr, Dept Biochem & Mol Biol, Albuquerque, NM 87131 USA
[3] Univ New Mexico, Hlth Sci Ctr, Dept Pathol, Albuquerque, NM 87131 USA
[4] Univ Colorado, Hlth Sci Ctr, Dept Internal Med, Denver, CO 80220 USA
[5] Univ Colorado, Hlth Sci Ctr, Dept Pathol, Denver, CO 80220 USA
[6] Univ Colorado, Hlth Sci Ctr, Dept Biostat, Denver, CO 80220 USA