Article History
Received: 30 January 2019
Accepted: 1 March 2019
First Online: 6 March 2019
Compliance with ethical standards
:
: Authors declare that they have no conflicts of interest.
: This study was approved by the local Ethics Committee and was performed according to the Declaration of Helsinki.
: Participants were informed on aims and possible risks of the study, both orally and in writing, and gave their written informed consent to participate in the study.