As a result of three decades of painstaking work, R. Gjessing (1932–1960) published ten classical Beiträge zur Somatologie der periodischen Katatonie. These studies are being continued by L. R. Gjessing (1956, 1958, 1964, 1965) on some of the original patients and on additional subjects.
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Gjessing et al. (1967) studied this question.
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