key role with regard to Until very recently, professional interac­ etiology, differential diagnoses, and treat­ tion and mutual evaluation regarding ment has not only stimulated research in these contradictory views and results have this field but has also provoked growing been almost non- existent. Together with controversy among clinicians and resear­ European and American colleagues, we chers. Biologically oriented authors have addressed these questions in a previous interpreted anxiety disorders with panic volume, examining in more detail the attacks as "endogenous" disorders linked epidemiological, psychopathological, and to depression, claiming pharmacological experimental evidence for each of these treatments to be the essential interven­ positions (Hand and Wittchen 1986).