Received: 11 June 2021
Accepted: 18 February 2022
First Online: 16 March 2022
: This study was approved by our local research ethics board: Health Research Ethics Board of Alberta—Cancer Committee (HREBA.CC-17–0183). Because this study only used the secondary data of patients, the consent to participate was not required by the ethics review committee. Because this study only used the secondary data and limited information (i.e., the date of chemotherapy, radiotherapy, cancer center visit) from the backend dataset of cancer center electronic information system, which are structured data with patient identifications being removed before analyses. In addition, due to the retrospective nature of the study, our local research ethics board approved waiver of patient consent.
: Not applicable.
: The authors declare that they have no competing interests.