- Students having posttraumatic stress (PTSD) as defined according to a scoring algorithm of the Harvard Trauma Questionnaire previously described by the Harvard Refugee Trauma group and used in a Kosovar Albanian population. This definition of PTSD requires a score of 3 or 4, on a Likert scale of 1-4, on at least one of the four of the reexperiencing symptoms (Criterion B), at least 3 of the 7 avoidance and numbing symptoms (Criterion C), and at least 2 of the 5 arousal symptoms (Criterion D) in addition to exposure to a traumatic event (Criterion A).