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Print Article: KA-03539

What are NCBI's guidelines for high-frequency retrievals using NCBI web services?

You should avoid high-frequency hits to NCBI's web interface for any type of information retrieval. See the Guidelines for Scripting Calls to NCBI Servers. Also note that any screen-scraping of PubMed Central articles is forbidden. For any bulk searches and data retrievals you should consider NCBI API's, which bypass the web: