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N Engl J Med. 1999 Oct 28;341(18):1389-92.

Direct sale of sildenafil (Viagra) to consumers over the Internet.

Author information

1
University of Pennsylvania School of Medicine, Philadelphia 19104-6021, USA.
PMID:
10536133
DOI:
10.1056/NEJM199910283411810
[Indexed for MEDLINE]

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