Text and Data Mining valid from 2019-10-31
Received: 9 April 2018
Accepted: 23 September 2019
First Online: 31 October 2019
Ethics approval and consent to participate
: The participants signed an informed consent before the start of the study. The study was conducted in accordance with the Declaration of Helsinki and was approved by the ethics committee of the University.
: Not applicable
: The authors declare that they have no competing interests.