• 1
    Cao B, Li XW, Mao Y et al. , National Influenza A Pandemic (H1N1) 2009 Clinical Investigation Group of China. Clinical features of the initial cases of 2009 pandemic influenza A (H1N1) virus infection in China. N Engl J Med 2009; 361:25072517.
  • 2
    Centers for Disease Control and Prevention. Swine-origin influenza A (H1N1) virus infections in a school – New York City, April 2009. MMWR Morb Mortal Wkly Rep 2009; 58:470472.
  • 3
    Novel Swine-Origin Influenza A (H1N1) Virus Investigation Team. Emergence of a novel swine-origin influenza A (H1N1) virus in humans. N Engl J Med 2009; 360:26052615.
  • 4
    Health Protection Agency and Health Protection Scotland new influenza A(H1N1) investigation teams. Epidemiology of new influenza A (H1N1) in the United Kingdom, April–May 2009. Eurosurveillance, 14(9):12. Available at (accessed 30 May 2010).
  • 5
    Cholewińska G, Higersberger J, Podlasin R et al. Clinical manifestations, diagnosis and treatment of swine flu (A/H1N1) infection among patients hospitalized in the Hospital of Infectious Diseases in Warsaw in 2009. Przegl Epidemiol 2010; 64:1519.
  • 6
    Hosmer DW, Hosmer T, Le Cessie S, Lemeshow S. A comparison of goodness-of-fit tests for the logistic regression model. Stat Med 1997; 16:965980.
  • 7
    Hanley JA, McNeil BJ. The meaning and use of the area under a receiver operating characteristic (ROC) curve. Radiology 1982; 143:2936.