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The European Journal of Health Economics > 2019 > 20 > 1 > 155-172
Problemy Ekorozwoju > 2016 > Vol. 11, nr 1 > 65--72
The International Journal of Health Planning and Management > 25 > 4 > 350 - 367
European Journal of Population > 2009 > 25 > 3 > 239-255