exact nature http://content.healthaffairs.org/content/28/1/37.full http://content.healthaffairs.org/content/28/1/37.full http://content.healthaffairs.org/content/28/1/37.full http://content.healthaffairs.org/content/28/1/37.full funding for preventive medicine and public health http://content.healthaffairs.org/content/28/1/37.full