Document the method of twin classification. Twins with pulmonary adenocarcinoma.
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D000230:Adenocarcinoma / Q000235:genetics*; D004200:Diseases in Twins / Q000235:genetics*; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D014427:Twins / Q000235:genetics*