Document is current

Article History

Received: 14 October 2020

Accepted: 8 February 2021

First Online: 8 March 2021

Compliance with ethical standards

:

: The authors report no conflicts of interest. The authors are responsible for the content and writing of the paper.

: The SEER data are de-identified and do not include any protected health information. The data are publicly available and exempt under the ethical board review of the corresponding author’s institution.