tokens: The subjects were exposed to cold air ( 4 degrees C ) twice/d , 30 min/exposure , for a total of 80 exposures .
folded_tokens: the subjects were exposed to cold air ( 4 degrees c ) twice/d , 30 min/exposure , for a total of 80 exposures .
labels: O O O O O O O O O O O O O O O O O O O O O O O O