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some pictures cannot be downloaded. Error: failed to extract image PMC4889020/nihms790182f4.jpg from archive ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_package/da/a9/PMC4889020.tar.gz: "filename 'PMC4889020/nihms790182f4.jpg' not found" Image PMC4889020/nihms790182f4.jpg not found in archive ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_package/da/a9/PMC4889020.tar.gz, skipping