Display only one reference according to priority given

[ddelpiano]

Requirements: DOI > PMCID > PMID

if Doi is present we display only this and discard the other 2.

if pmcid and pmid are present but not doi we discard the pmid.

pmid is the last in term of priority, so we show this only if it is the only reference available.

[ddelpiano]

@stappan could you please confirm the requirements and assign the priority to this? thanks

[stappan]

@ddelpiano this is for sentence ingestion, i believe. So when the ingestion provides more than one citation format, the record should lead with DOI. If no DOI, then PMCID. If no DOI or PMCID, then PMID.

But I believe that this work has been completed, though?