Brian MacMahon
...that epidemiologist Brian MacMahon showed for the first time that women who give birth early in life have a lower risk of breast cancer?
...that <a href="./Epidemiology" id="mwFV0" rel="mw:WikiLink" title="Epidemiology">epidemiologist</a> <b id="mwFV4"><a href="./Brian_MacMahon" id="mwFV8" rel="mw:WikiLink" title="Brian MacMahon">Brian MacMahon</a></b> showed for the first time that women who give birth early in life have a lower risk of <a href="./Breast_cancer" id="mwFWA" rel="mw:WikiLink" title="Breast cancer">breast cancer</a>?