Table 1. Search strategies and the number of papers identified from each database.

MeSH: Medical Subject Headings

Databases	Search strategy	Number of articles
PubMed	Melatonin AND Migraine	162
PubMed MeSH database	("Melatonin"[Mesh]) AND "Migraine Disorders"[Mesh], ("Migraine Disorders"[Mesh]) AND "Melatonin/therapeutic use"[Mesh]	105
PubMed Central	(Melatonin [Body - Key Terms]) AND Migraine [Body - Key Terms]	315
ResearchGate	Melatonin AND Migraine Disorders	100
Cochrane Library	Melatonin AND Migraine	19
ScienceDirect	Title, abstract, keywords: Melatonin AND Migraine	34
Total		735