Abstract

The online version of the original article can be found underdoi:10.1007/s00420-012-0780-6.M. P. Gatto (&)School in BioStatistics, Sapienza University of Rome,P.le Aldo Moro 5, 00185 Rome, Italye-mail: mariapia.gatto@ispesl.itG. L. Di TannaDepartment of Public Health and Infectous Diseases,Sapienza University of Rome, Rome, Italy

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