fries 1980 optional
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7/23/2019 Fries 1980 Optional
http://slidepdf.com/reader/full/fries-1980-optional 1/6The New England Journal of Medicine
Downloaded from nejm.org at UC SHARED JOURNAL COLLECTION on October 15, 2011. For personal use only. No other uses without permission.From the NEJM Archive. Copyright © 2010 Massachusetts Medical Society. All rights reserved.
7/23/2019 Fries 1980 Optional
http://slidepdf.com/reader/full/fries-1980-optional 2/6The New England Journal of Medicine
Downloaded from nejm.org at UC SHARED JOURNAL COLLECTION on October 15, 2011. For personal use only. No other uses without permission.From the NEJM Archive. Copyright © 2010 Massachusetts Medical Society. All rights reserved.
7/23/2019 Fries 1980 Optional
http://slidepdf.com/reader/full/fries-1980-optional 3/6The New England Journal of Medicine
Downloaded from nejm.org at UC SHARED JOURNAL COLLECTION on October 15, 2011. For personal use only. No other uses without permission.From the NEJM Archive. Copyright © 2010 Massachusetts Medical Society. All rights reserved.
7/23/2019 Fries 1980 Optional
http://slidepdf.com/reader/full/fries-1980-optional 4/6The New England Journal of Medicine
Downloaded from nejm.org at UC SHARED JOURNAL COLLECTION on October 15, 2011. For personal use only. No other uses without permission.From the NEJM Archive. Copyright © 2010 Massachusetts Medical Society. All rights reserved.
7/23/2019 Fries 1980 Optional
http://slidepdf.com/reader/full/fries-1980-optional 5/6The New England Journal of Medicine
Downloaded from nejm.org at UC SHARED JOURNAL COLLECTION on October 15, 2011. For personal use only. No other uses without permission.From the NEJM Archive. Copyright © 2010 Massachusetts Medical Society. All rights reserved.