Atanasova Elka, Pavlova Milena, Groot Wim
Department of Health Economics and Management, Faculty of Public Health, Medical University of Varna , Varna , Bulgaria.
Department of Health Services Research, Faculty of Health, Medicine and Life Sciences, CAPHRI, Maastricht University Medical Center, Maastricht University , Maastricht , Netherlands.
Front Public Health. 2015 Jul 8;3:175. doi: 10.3389/fpubh.2015.00175. eCollection 2015.