Funding for this research was provided by:
Vietnam Academy of Science and Technology (VAST.HTQT.Sec.01/16-17)
Ministerstvo Školství, Mládeže a Tělovýchovy (LO1415, LD15040, CzeCOS/ICOS Reg.No. LM2015061)
Article History
Received: 30 June 2020
Revised: 2 October 2020
Accepted: 18 October 2020
First Online: 4 November 2020
Compliance with ethical standards
:
: The authors declare no competing financial interests.