1. Asthma and posttraumatic stress symptoms 5 to 6 years following exposure to the World Trade Center terrorist attack Farfel, Mark R.; Friedman, Stephen; Perlman, Sharon E.; Stellman, Steven D.; Walker, Deborah J.; Wu, David; Yu, Shengchao; Thorpe, Lorna E.; Brackbill, Robert M.; Ekenga, Christine C.; DiGrande, Laura; Hadler, James L. 2009 Articles EpidemiologyPublic health