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

      The New England journal of medicine
      3',5'-Cyclic-GMP Phosphodiesterases, antagonists & inhibitors, Commerce, standards, statistics & numerical data, Drug Prescriptions, Erectile Dysfunction, diagnosis, drug therapy, Humans, Internet, Male, Medical History Taking, Office Visits, Phosphodiesterase Inhibitors, Physician's Practice Patterns, Piperazines, Purines, Questionnaires, Sulfones, United States

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