Sikorska-Szaflik, Hanna
Sozańska, Barbara
Funding for this research was provided by:
Uniwersytet Medyczny im. Piastów Slaskich we Wroclawiu (STM.A220.17.048)
Article History
Received: 29 March 2019
Accepted: 3 March 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: Informed consent was obtained by all parents of individual participants included in the study and also by all participants aged more than 15 years, and the study received approval from the Wroclaw Medical University Ethics Board (number: KB-16/2017).
: Not applicable.
: The authors declare that they have no competing interests.