Table 1.

Inclusion and exclusion criteria.

Criteria	Inclusion	Exclusion
Population	(i) Human study	(i) Animal study
Instruments	(ii) At least one physiological measurement	(ii) No physiological measurement
Outcome	(iii) A clinical pain measure physiologically obtained	(iii) No clinical pain measure (iv) Only a self-report measure
Report	(iv) Review, systematic review, meta-analysis (v) Full-text available	(v) Article, letter to the editor (vi) Full-text not available
Period	(vi) 2007–2019	(vii) All other years
Language	(vii) Dutch, English, French, German, Spanish	(viii) All other languages