Text and Data Mining valid from 2019-04-09
Received: 27 December 2018
Revised: 1 February 2019
Accepted: 26 March 2019
First Online: 9 April 2019
Compliance with ethical standards
: The Declaration of Helsinki was followed and the collaborative protocol was approved by the Institutional Review Board at each participating center. Informed consent was obtained where required by the institution’s Institutional Review Board.
: The authors declare that they have no conflict of interest.