Manfredi Roberto, Cascavilla Alessandra, Magistrelli Eleonora, Legnani Giorgio, Sabbatani Sergio
Division of Infectious Diseases, Department of Medical and Surgical Sciences, S. Orsola-Malpighi Hospital, "Alma Mater Studiorum" University of Bologna, Via Massarenti 11, 40138, Bologna, Italy,
Eur J Epidemiol. 2015 May;30(5):459-61. doi: 10.1007/s10654-015-0020-y. Epub 2015 Mar 18.