Appendix 1.

Search strategy.

Database	Search Terms	Results
MEDLINE PubMed	TDCS “noninvasive brain stimulation”[Title/Abstract] OR “non-invasive brain stimulation”[Title/Abstract] OR “neuromodulation”[Title/Abstract] OR “NIBS”[Title/Abstract] OR “motor cortex stimulation”[Title/Abstract] OR “Transcranial Electric Stimulation”[Title/Abstract] OR “transcranial direct current stimulation”[MeSH Terms] OR “transcranial direct current stimulation”[Title/Abstract] OR “tdcs”[All Fields] OR “transcranial direct current stimulation”[All Fields]	18,246
	Fibromyalgia: “Fibromyalgia”[MeSH Terms] OR “Fibromyalgia”[All Fields] OR “fatigue syndrome, chronic”[MeSH Terms] OR “chronic fatigue syndrome”[All Fields] OR “Myofascial Pain Syndromes”[MeSH Terms] OR “Myofascial Pain Syndrome”[All Fields] OR “Trigger Points”[MeSH Terms] OR “Trigger Points”[All Fields] OR “Trigger Point Pain”[All Fields] OR “Fibromialgia”[All Fields] OR “Widespread chronic pain”[All Fields] OR “widespread pain”[All Fields]	27,761
	TDCS and FIBROMYALGIA	109
EMBASE	TDCS ‘transcranial direct current stimulation’/exp OR ‘noninvasive brain stimulation’:ab,ti OR ‘noninvasive brain stimulation’/exp OR ‘non-invasive brain stimulation’:ab,ti OR ‘transcranial direct current stimulation’:ab,ti OR ‘neuromodulation’:ab,ti OR ‘neuromodulation’/exp OR ‘nibs’:ab,ti OR ‘tdcs’:ab,ti OR ‘transcranial direct current stimulator’	59,921
	FIBROMYALGIA ‘fibromyalgia’/exp OR ‘fibromyalgia’:ab,ti OR ‘myofascial pain’/exp OR ‘myofascial pain syndrome’/exp OR ‘myofascial pain’:ab,ti OR ‘trigger point pain’ OR ‘trigger point’:ab,ti OR ‘chronic fatigue syndrome’/exp OR ‘chronic fatigue syndrome’:ab,ti OR ‘chronic fatigue’:ab,ti OR ‘widespread chronic pain’ OR ‘widespread chronic pain’:ab,ti	45,271
	TDCS and FIBROMYALGIA	490
	EMBASE FILTER by Study Type: clinical trial + randomized controlled trial + randomized controlled trial topic	130
WEB OF SCIENCE	TDCS transcranial direct current stimulation OR noninvasive brain stimulation OR noninvasive brain stimulation OR non-invasive brain stimulation OR transcranial direct current stimulation OR neuromodulation OR neuromodulation OR nibs OR tdcs	32,311
	FIBROMYALGIA Fibromyalgia OR chronic fatigue syndrome OR Myofascial Pain Syndrome OR Myofascial Pain OR Trigger Points OR trigger point pain OR Fibromialgia OR chronic fatigue syndrome OR Widespread chronic pain OR Widespread pain	65,205
	TDCS and FIBROMYALGIA	267
	WeB of Science Filter - Document Type Articles	179