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The views expressed by the authors in the publication do not necessarily reflect the views of the EuroQol Group. The authors declare that they have no conflicts of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and\/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was reviewed and approved by the (Portuguese) National Data Protection Commission (Ref. 1737\/2015) to elicit the preferences of the Portuguese general population, preserving the anonymity and confidentiality of the participants.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent was obtained from all individual participants included in the study. Participants were informed about their freedom for refusal.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}