== المراجع ==== وصلات خارجية ==* Channing.harvard.edu - 'The Nurses' Health Study', Channing Laboratory, Harvard University;Video* Video series on history of Nurses' Health Studies;Audio* PBS Frontline interview with Walter Willett (April 8, 2004)
==References====External links==* Channing.harvard.edu - 'The Nurses' Health Study', Channing Laboratory, Harvard University;Video*Video series on history of Nurses' Health Studies;Audio*PBS Frontline interview with Walter Willett (April 8, 2004)