Text and Data Mining valid from 2019-03-18
Received: 26 October 2018
Accepted: 11 March 2019
First Online: 18 March 2019
Compliance with ethical standards
: Dr. Taiga Wakabayashi, Dr. Emanuele Felli, Dr. Riccardo Memeo, Dr. Pietro Mascagni, Dr. Yuta Abe, Dr. Yuko Kitagawa, and Dr. Patrick Pessaux have no conflicts of interest or financial ties to disclose.