RT Journal Article SR Electronic T1 Junior doctors’ working hours and the circadian rhythm of hormones JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 127 OP 129 DO 10.7861/clinmedicine.6-2-127 VO 6 IS 2 A1 Wiebke Arlt YR 2006 UL http://www.rcpjournals.org/content/6/2/127.abstract AB