RT Journal Article SR Electronic T1 Correction: Screening for a new primary cancer in patients with existing metastatic cancer: a retrospective cohort study JF CMAJ Open JO CMAJ FD Canadian Medical Association SP E567 OP E567 DO 10.9778/cmajo.20180186 VO 6 IS 4 YR 2018 UL http://www.cmajopen.ca/content/6/4/E567.abstract AB