Text and Data Mining valid from 2019-01-16
Received: 24 August 2018
Accepted: 2 January 2019
First Online: 16 January 2019
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: For this type of study, formal consent is not required.