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Article History

Received: 11 September 2025

Accepted: 10 December 2025

First Online: 27 December 2025

Declarations

:

: This study adheres to the ethical standards of the Declaration of Helsinki and has been approved by the ethics committees of Hospital Universitario Ramón y Cajal (Reg. No. 311-22 acta 433 CEIM) and Universidad Rey Juan Carlos (Reg. No. 1601202303923). Data collection complied with the EU General Data Protection Regulation (2016/679).The study involved the use of participants' clinical data; therefore, each questionnaire was assigned a numerical code without including any identifying information. Data were handled exclusively by the principal investigator and securely stored, ensuring its use was limited to the research objectives.Given the vulnerable nature of the study population, efforts were made to keep data collection brief. The questionnaire was designed to be clear and accessible, avoiding technical jargon, lengthy phrases, or information overload. People eligible for the study were already aware of their diagnosis and prognosis. Before participation, everyone received an information sheet outlining the study details and the contact information of the principal investigator. Voluntary informed consent was obtained from each participant. No participants were surveyed while experiencing moderate or severe pain or other uncontrolled symptoms.This study did not involve the use of natural or environmental resources, did not affect biodiversity, and did not require the handling of biological materials.

: Not applicable.

: The authors declare no competing interests.