Currently distinguish.js looks for a DOI in the "search" field from GET requests to the /api endpoint, and if there's no DOI, assumes it's a URL. If DOI, calls requestFromDOI, if URL, calls requestFromURL.
However, requestFromPubMedID was recently added to requests.js, so this needs to be added as an option in the distinguish.js file. Use regex to determine if something is a PMID or PCMID, and call the requestFromPubMedID method. Continue to use URL as the default case.