Accepted: 3 October 2019
First Online: 16 March 2020
Compliance with ethical standards
: Anna Piotrowska, Olga Czerwińska-Ledwig, Marta Serdiuk, Katarzyna Serdiuk, and Wanda Pilch declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.