Received: 6 May 2020
Accepted: 17 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: Detailed information regarding clinicopathological variables was retrieved from the Colorectal Section Tumor Registry of Chang Gung Memorial Hospital. This study was approved by the Institutional Review Board. This project was reviewed and approved by our institutional ethics committee (No. 201801090B0).
: Not applicable.
: The authors declare that they have no competing interests.