2016, The privatization of spa companies in Poland – An evaluation of policy assumptions and implementation.

Szromek AR, Romaniuk P2, Hadzik A
Health Policy. 2016 Apr;120(4):362-8. doi: 10.1016/j.healthpol.2016.02.011. Epub 2016 Mar 2

https://www.ncbi.nlm.nih.gov/pubmed/26972546