At least three would-be Republican presidential contenders have said that vaccinating children should sometimes be done on a voluntary basis, but their careful comments on the issue underscore how problematic it could be for some of them in a primary fight.
원문출처 : http://edition.cnn.com/2015/02/02/politics/christie-vaccination-london/index.html?eref=edition
원문출처 : http://edition.cnn.com/2015/02/02/politics/christie-vaccination-london/index.html?eref=edition