[Comments on the night duty and shift system].
D000041:Absenteeism; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology; D009787:Occupational Medicine; D012449:Safety; D013997:Time Factors; D014937:Work