Text and Data Mining valid from 2019-06-17
Received: 13 March 2019
Accepted: 11 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: All subjects gave written informed consent and this research was approved Ethical Committee Approval: Semmelweis University TUKEB 30/2014.
: The authors declare that they have no competing interests.