The infrequency-posttraumatic stress disorder scale (Fptsd) for the MMPI-2: Development and initial validation with veterans presenting with combat-related PTSD. - Elhai,J.D.; Ruggiero,K.J.; Frueh,B.C.; Beckham,J.C.; Gold,P.B.; Feldman,M.E. (J Personal Assess, 2002)