Panic Disorder Respiratory Subtype: Psychopathology, Laboratory Challenge Tests, and Response to Treatment Freire, Rafael C.; Perna, Giampaolo; Nardi, Antonio E. Freire, Rafael C.; Perna, Giampaolo; Nardi, Antonio E. Less Harvard Review of Psychiatry. 18(4):220-229, July 2010. Abstract Abstract Favorites PDF Get Content & Permissions Buy