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. 2020 Jan 14;2020:4561831. doi: 10.1155/2020/4561831

(a).

(i) Continuous pain disproportionate to any inciting event
(ii) Reporting at least one symptom in at least three (clinical diagnostic criteria) or four (research diagnostic criteria) categories
(iii) Displaying at least one sign at the time of assessment in at least two categories
(iv) Lacking other diagnosis that could better explain the symptoms and signs