[1] Texas Tech Univ, Hlth Sci Ctr, Dept Microbiol & Immunol, Lubbock, TX 79430 USA
[2] Ist Clin Humanitas, Sci Direct, Milan, Italy
[3] Fdn Michele Rodriguez, Inst Quantitat Methods Med, Milan, Italy
[4] Univ Arkansas Med Sci, Div Obstet & Gynecol, Little Rock, AR 72205 USA