Text and Data Mining valid from 2019-08-05
Received: 28 January 2019
First Online: 5 August 2019
Compliance with ethical standards
: The authors declare they have no conflicts of interest.
: All procedures performed in this study were in accordance with the local IRB and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.