Text and Data Mining valid from 2019-06-25
Received: 26 April 2019
Accepted: 5 June 2019
First Online: 25 June 2019
Ethics approval and consent to participate
: The research protocol was approved by the Scientific Ethics Committee of the SST of the Ministry of Health. All participants signed a written informed consent.
: Not applicable.
: The authors declared that they have no competing interests.