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This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).
This article has been retracted at the request of the Editor-in-General. The Editor-in-General has been made aware that this paper has been published in another journal, Infect Dis Rep, Vol. 3 No. 1 (2011), DOI: 10.4081/idr.2011.e2.
