Masiewicz, Elżbieta
Grzybowski, Andrzej
Grzybowska, Katarzyna
Pawlus, Sebastian
Pionteck, Jürgen
Paluch, Marian
Article History
Received: 25 March 2015
Accepted: 31 July 2015
First Online: 14 September 2015
Competing interests
: The authors declare no competing financial interests.