Van Nguyen, Phu http://orcid.org/0000-0003-0209-6862
Plocek, Vítězslav http://orcid.org/0000-0003-0459-2771
Váchová, Libuše http://orcid.org/0000-0002-8143-6054
Palková, Zdena http://orcid.org/0000-0002-0864-8042
Article History
Received: 16 August 2019
Accepted: 29 January 2020
First Online: 13 February 2020
Competing interests
: The authors declare no competing interests.