fix to get results for PMID search, still exclude books

server/eutils/api.js

@@ -17,7 +17,9 @@ module.exports = app => {
 
     const { term, db, retstart, sort } = req.query
     const encodedTerm = encodeURIComponent(term)
-    const url = `https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=${db}&term=${encodedTerm}+NOT+pubmed+books[filter]&sort=${sort}&retmode=json&retstart=${retstart}&retmax=25${
+    const url = `https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=${db}&term=${encodedTerm}${
+      /^\d+$/.test(encodedTerm) ? '[uid]' : ''
+    }+NOT+pubmed+books[filter]&sort=${sort}&retmode=json&retstart=${retstart}&retmax=25${
       eutilsApiKey ? `&api_key=${eutilsApiKey}` : ''
     }`