title: WHO extends its SARS-related travel advice to Beijing and Shanxi Province (China) and to Toronto (Canada), 23 April 2003.
mesh_terms: D002681:China / Q000453:epidemiology; D021821:Communicable Diseases, Emerging / Q000453:epidemiology; D004196:Disease Outbreaks; D006801:Humans; D009864:Ontario / Q000453:epidemiology; D045169:Severe Acute Respiratory Syndrome / Q000453:epidemiology*; D014195:Travel; D014944:World Health Organization