updated readme

MRCIEU · Jun 8, 2020 · 2cdbad0 · 2cdbad0
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diff --git a/README.md b/README.md
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 ```
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+### Notes
+
+The call to PubMed is limited to 1 million articles. 
+
+```
+http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi? {'db': 'pubmed', 'term': '', 'retmax': '1000000', 'rettype': 'uilist'}
+```
diff --git a/notebooks/analysis.ipynb b/notebooks/analysis.ipynb