Funding for this research was provided by:
Department funding (Base33)
Received: 26 May 2020
Accepted: 3 July 2020
First Online: 9 July 2020
: Declarations of interest: none.
: The study protocol was approved by our institutional review board (17 April 2015, M27-002), and the need for written informed consent was waived due to the retrospective nature of the study.
: No individual person’s data was included.