Effects of headache on working ability: a survey of an urban and a rural population in Northern Finland.
D000041:Absenteeism; D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D005387:Finland; D006261:Headache / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012424:Rural Population; D014505:Urban Population; D014937:Work