Text and Data Mining valid from 2019-04-05
Received: 25 March 2019
Accepted: 29 March 2019
First Online: 5 April 2019
Compliance with ethical standards
: The authors report no conflicts of interest.
: All human studies have been approved by the appropriate local ethics committee and have been performed in accordance with the ethical standards laid down in the Declaration of Helsinki. Informed consent was obtained prior to inclusion in the study.