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Health Services Research > 56 > 4 > 604 - 614
BMC Health Services Research > 2016 > 16 > 1 > 1-11
Social Science & Medicine > 2015 > 145 > C > 243-248
BMC Health Services Research > 2014 > 14 > 1 > 1-16
Journal of Taibah University Medical Sciences > 2012 > 7 > 2 > 61-68
Health Services Research > 45 > 1 > 62 - 78
Journal of Health Economics > 2002 > 21 > 6 > 1049-1069