RT Journal Article SR Electronic T1 Shift work and health: a critical review of the literature JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 92 OP 92 DO 10.1136/oem.37.1.92 VO 37 IS 1 A1 E W Macdonald YR 1980 UL http://oem.bmj.com/content/37/1/92.abstract AB