title: Shift work--some medical and social factors.
mesh_terms: D002940:Circadian Rhythm; D005767:Gastrointestinal Diseases / Q000209:etiology; D006801:Humans; D008297:Male; D009787:Occupational Medicine; D012893:Sleep Wake Disorders / Q000209:etiology; D012959:Socioeconomic Factors; D006113:United Kingdom