Text and Data Mining valid from 2019-05-21
Received: 7 November 2018
Accepted: 10 May 2019
First Online: 21 May 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Canton Ticino, conducted according to the Declaration of Helsinki and written informed consent forms were signed by participants.
: Not applicable.
: The authors declare that they have no competing interests.
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