Text and Data Mining valid from 2019-11-09
Received: 22 May 2019
Accepted: 7 November 2019
First Online: 9 November 2019
Compliance with ethical standards
: Each author certifies that he or she, or a member of their immediate family, has no commercial associations (e.g., consultancies, stock ownership, equity interest, patent/licensing arrangements) that might pose a conflict of interest in connection with the submitted article.
: The local institutional review board approved this study. All patients provided informed consent.