Discrepancy between Self-Reported and Actual ...

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The New England Journal of Medicine. Downloaded from nejm.org on December 27, ... Copyright © 1992 Massachusetts Medical Society. All rights reserved.
The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on December 27, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.