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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1999 1
2000 1
2021 0
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Page 1
Assessing the risk of breast cancer.
Armstrong K, Eisen A, Weber B. Armstrong K, et al. N Engl J Med. 2000 Feb 24;342(8):564-71. doi: 10.1056/NEJM200002243420807. N Engl J Med. 2000. PMID: 10684916 Review. No abstract available.
Direct sale of sildenafil (Viagra) to consumers over the Internet.
Armstrong K, Schwartz JS, Asch DA. Armstrong K, et al. N Engl J Med. 1999 Oct 28;341(18):1389-92. doi: 10.1056/NEJM199910283411810. N Engl J Med. 1999. PMID: 10536133 No abstract available.