Text and Data Mining valid from 2018-12-01
Received: 18 March 2018
Accepted: 27 November 2018
First Online: 17 December 2018
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: 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.
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