title: Diurnal variation and individual differences in the perception of intractable pain.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001831:Body Temperature; D002940:Circadian Rhythm; D005120:Extraversion, Psychological; D005260:Female; D006801:Humans; D007206:Individuality; D007439:Introversion, Psychological; D008297:Male; D008875:Middle Aged; D010148:Intractable Pain; D010555:Personality Inventory; D012737:Sex Factors; D012931:Social Environment; D014851:Wakefulness