The American Society for Parenteral and Enteral Nutrition (ASPEN) is a US-based professional organization. Its members include dieticians, nurses, pharmacists, physicians and scientists who are involved in providing clinical nutrition to patients. ASPEN was founded on June 5, 1975. It was officially incorporated on November 30, 1976. It has almost 6,000 members. The society runs an annual meeting, the ASPEN Nutrition Science & Practice Conference.

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