Altered biomarkers of mucosal immunity and reduced vaginal Lactobacillus concentrations in sexually active female adolescents. - Rebecca Pellett Madan; Colleen Carpenter; Tina Fiedler; Sabah Kalyoussef; Thomas C McAndrew; Shankar Viswanathan; Mimi Kim; Marla J Keller; David N Fredricks; Betsy C Herold (PLoS ONE, 2012)