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in a paper published in 1933. In the paper, he describes 187 cases of cancer of the paranasal sinuses and how their prognosis was worse if the tumor stretched behind an imaginary line from the medial
109:Öhngren, L. Georg. Malignant tumours of the maxillo-ethmoidal region: a clinical study with special reference to the treatment with electrosurgery and irradiation. Mercator Tr., 1933.
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