Text and Data Mining valid from 2019-01-14
Received: 29 May 2018
Accepted: 29 December 2018
First Online: 14 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Written informed consent was obtained from all the subjects before enrollment in the study.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research/ethics committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: This article does not contain any studies with animals performed by any of the authors.