TABLE 1.

Search strategy.

MEDLINE	thyroid cancer, papillary [Mesh] AND (“multifocal”[Title/Abstract] OR “multifocality”[Title/Abstract])
Web of Science	TI = (papillary thyroid cancer) OR TI = (papillary thyroid carcinoma) OR TI = (papillary thyroid neoplasm)) AND (TS = multifocal OR TS = multifocality
Embase	multifocality: ab, ti OR multifocal: ab, ti) AND (“papillary thyroid cancer”: ti OR “papillary thyroid carcinoma”: ti OR “papillary thyroid neoplasm”: ti