Goodfriendsusa.blogspot.com (2009-12-08) ↑ https://news.yahoo.com/s/ap/20091208/ap_on_re_as/as_koreas_swine_flu;_ylt=Ano4rtHUnNuIVB6qnxVoPoYBxg8F;_ylu=X3oDMTJxcnZudTlqBGFzc2V0A2FwLzIwMDkxMjA4L2FzX2tvcmVhc19zd2luZV9mbHUEcG9zAzMyBHNlYwN5bl9wYWdpbmF0ZV9zdW1tYXJ5X2xpc3QEc2xrA3Nrb3JlYW5wcmVzaQ--. Retrieved December 9, 2009. Missing or empty |title= (help) ↑ The Severity of Pandemic H1N1 Influenza in the United States, from April to July 2009: A Bayesian Analysis.