Cannot import from DOI

I usually import references using the Medline/PUBMED ID and want to do the same thing with DOI references.

For example this puppy:

A novel robust index to assess beat-to-beat variability in heart rate time-series analysis
Garcia-Gonzalez, M.A.; Pallas-Areny, R.
Page(s): 617-621
Digital Object Identifier 10.1109/10.923779

PROBLEM: When I try and add a DOI using Zotero's "Add Item by Identifier"*, I get the error: "Zotero could not find a record for the specified identifier. Please verify the identifier and try again."

I have tried this on a number of DOI's and nothing works.

What am I doing wrong?

Thank you,


Derek


* e.g., As I do with Pubmed, I try pasting in the DOI 10.1109/10.923779
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