The New England Journal of Medicine Downloaded from nejm.org at PENN STATE UNIVERSITY on November 16, 2015. For personal use only. No other uses without permission. Copyright © 1991 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at PENN STATE UNIVERSITY on November 16, 2015. For personal use only. No other uses without permission. Copyright © 1991 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at PENN STATE UNIVERSITY on November 16, 2015. For personal use only. No other uses without permission. Copyright © 1991 Massachusetts Medical Society. All rights reserved.

Maternal serum alpha-fetoprotein screening.

The New England Journal of Medicine Downloaded from nejm.org at PENN STATE UNIVERSITY on November 16, 2015. For personal use only. No other uses witho...
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