Schwartz G E, Goetz R R, Klein D F, Endicott J, Gorman J M
Department of Psychiatry, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA.
Anxiety. 1996;2(3):145-8. doi: 10.1002/(SICI)1522-7154(1996)2:3<145::AID-ANXI6>3.0.CO;2-O.