RT Journal Article SR Electronic T1 Stress of first postgraduate year leaves mark at cellular level for medical trainees JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E773 OP E774 DO 10.1503/cmaj.109-5770 VO 191 IS 27 A1 Carolyn Brown YR 2019 UL http://www.cmaj.ca/content/191/27/E773.abstract