18thcentury 19thcentury 2011h-254 20thcentury 614 ambulatorycare ambulatorymedicalcare autobiography biography brian canada casestudies control emergencymedicine emergencyphysicians emergencyservices goldman greatbritain history hospitals nationalhealthprograms nationalhealthservices ontario organizationalinnovation prevention smallpox smallpoxvaccine vaccination vaccines wa540fa1 wz100g6192010