As Mr Kern and Dr Lewy suggested, it was not our intention to present a detailed historical review in our letter. (We have published such a review elsewhere.1) Nevertheless, we welcome the clarifications and additions from these two important contributors to the evolving story of phototherapy of seasonal affective disorder. Incidentally, in our letter, Mr Kern should have been identified as Herbert E. Kern, BS, instead of Herbert A. Kern, PhD.Most of our publications cited by Mr Kern and Dr Lewy were cited in our original Archives article.Those who write about seasonal affective disorder might also wish to cite the contributions of Marx,2 a German endocrinologist whose work was not known to us when we began to investigate phototherapy but who, in 1946, accomplished the following: (1) described recurrent winter depression, including the characteristic "atypical" feature of overeating; (2) identified light deficiency as the
Wehr TA, Rosenthal NE. Corrections and Additions to the History of Light Therapy and Seasonal Affective Disorder-Reply. Arch Gen Psychiatry. 1990;47(1):91. doi:10.1001/archpsyc.1990.01810130093015
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