Some DOI cells show the wrong ID

[mwatts15]

On the References page: https://chopen.herokuapp.com/ion_channel/reference/

I would expect each cell in the DOI column to either be empty or have a valid DOI. Instead, it sometimes has a Pubmed ID or, as in the second image below, part of a DOI.

Examples:

[VahidGh]

@mwatts15, Thanks for checking this. Unfortunately, some old references do not have a DOI at all. So, it's been replaced by its PMID, by default.
As for the second case, did you find any other sample?
They have been collected automatically using 'metapub' package.

[mwatts15]

In the first case, I really think the DOI column should be empty if a valid DOI wasn't collected. The link doesn't work if the value there is invalid, which is pretty misleading.

For the second. I visually scanned all of the entries on the app and didn't see any others -- lucky that one was so early in the list!

[VahidGh]

@mwatts15, will work on it. However, the problem with old refs still remains.
Is it possible to use PMID instead of DOI?