Article 1 PTSD - posttraumatic stress disorder Sprague Dawley rat 1 animal experiment 1 animal model 1 anxiety 1 corticosterone 1 corticosterone blood level 1 early life stress 1 female 1 locomotion 1 male 1 maternal care 1 maternal deprivation 1 multicenter study 1 nonhuman 1 open field test 1 posttraumatic stress disorder 1 rat 1 sex difference 1 sex differences 1 startle 1 startle reflex 1