Strzeszewska, Anna
Alster, Olga
Mosieniak, Grażyna
Ciolko, Agata
Sikora, Ewa
Article History
Received: 16 August 2017
Revised: 13 October 2017
Accepted: 17 October 2017
First Online: 19 January 2018
Competing interests
: The authors declare that they have no conflict of interest.