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BMC Health Services Research > 2018 > 18 > 1 > 1-8
Pediatric Allergy and Immunology > 26 > 5 > 466 - 473
Health Services Research > 50 > 4 > 1021 - 1042
Saudi Pharmaceutical Journal > 2013 > 21 > 3 > 267-276
Social Science & Medicine > 1997 > 44 > 8 > 1161-1168