Funding for this research was provided by:
Centre of Oncology - Maria Sklodowska-Curie Memorial Institute Cracow Branch
Article History
Received: 22 November 2018
Accepted: 3 June 2019
First Online: 18 June 2019
Conflict of interest
: A. Mucha-Małecka, A. Chrostowska, K. Urbanek and K. Małecki declare that they have no competing interests.