Table 2.

Inclusion and exclusion criteria *.

Inclusion Criteria
(a) Studies dealing with the social legitimacy of pain from any discipline or approach. (b) Studies written in English or Spanish. (c) Studies conducted in humans.
Exclusion Criteria
Legitimacy	Pain	Methodological criteria
(a) Studies on the legitimacy of euthanasia or the legitimacy of using certain drugs/medicines (for example: opioids). (b) Studies on the legitimacy or social legitimacy of any other process, concept, or element different from pain (in any of its dimensions).	(c) Studies focusing on pain (in any of its dimensions) without considering its social legitimacy. (d) Studies focusing on painful processes with marked suffering, but understood as a process in themselves, for instance, mourning. (These studies will be excluded if they do not specifically focus on the social legitimacy of pain). (e) Studies linked to the efficiency of drugs/medicines to relieve pain. (f) Studies linked to the efficiency of diagnostic tests.	(g) Studies conducted in animals. (h) Studies whose complete text cannot be accessed.

* When we refer to “studies” we are referring to all types of scientific documents, without distinction by design or methodology. Sources: prepared by the authors.