Inclusion criteria | Exclusion criteria |
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• Quantitative, qualitative, or mix-methods systematic reviews • Focus on attitudes toward at least one or more of the following EoL practices or issues: withdrawal or withholding of life-prolonging treatments, euthanasia, PAS, patient refusal of life-sustaining interventions, palliative sedation or ACP • Citizens, physicians, nurses, or a combination of physicians and nurses as participants • At least one sample of participants from European countries | • Primary empirical research, including those misclassified as systematic reviews by PubMed, CINAHL, and PsycINFO • Unclear whether participants were physicians, nurses, or citizens • Unclear country of origin of participants |