Original research: Trauma exposure and posttraumatic stress disorder among employees of New York City companies affected by the september 11, 2001 attacks on the World Trade Center

Carol S North, David E. Pollio, Rebecca P. Smith, Richard V. King, Anand Pandya, Alina M. Suri, Barry A. Hong, Denis J. Dean, Nancy E. Wallace, Daniel B. Herman, Sarah Conover, Ezra Susser, Betty Pfefferbaum