Secondary Source Identifier [si]
The [si] qualifier identifies a secondary source that supplies information, e.g., other data sources, databanks and accession numbers of molecular sequences (e.g., GenBank; ClinicalTrials.gov).
- Use [si] to qualify the Secondary Source Identifier. The field is composed of a source followed by a slash followed by an accession number.
clinicaltrials.gov/ nct00000419 [si]
Last Reviewed: October 29, 2019