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abbreviation for nasal.
Normative Aging Study
Narcotics Assistance Section
National Acceptor Survey
National Asthma Survey
National Autistic Society
new active substance
no abnormality seen
nucleus accumbens septum
1. Neonatal abstinence syndrome. See Neonatal withdrawal syndrome.
2. No abnormalities seen.
National Academy of Sciences, National Academies,
An organization comprising a selected group of honored or distinguished engineers and scientists who are called upon to review and explore the uses of science and technology as they may further or enlighten national interests in the U.S.