Nej m 199307083290202

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The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on April 9, 2013. For personal use only. No other uses without permission.

Copyright 1993 Massachusetts Medical Society. All rights reserved.

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