Received: 26 May 2020
Revised: 19 July 2020
Accepted: 21 July 2020
First Online: 4 August 2020
Compliance with ethical standards
: The authors have no conflicts of interest to declare.
: The study was approved by local ethical committee and was performed according to the principles of the Declaration of Helsinki.
: All participants gave their informed written consent prior to participation.
: Not applicable.