aDepartment of Infectious Diseases, Luigi Sacco Hospital
bUniversity of Milano, Milano and Fondazione Don C. Gnocchi, IRCCS, Milano, Italy.
Correspondence to Mario Clerici, MD, Department of Physiopathol and Transplants, LITA Segrate Via Flli Cervi, 93, 20090 Segrate-Milano, Italy. Tel: +39 02 5033 0412; e-mail: firstname.lastname@example.org
Received 17 January, 2013
Accepted 8 February, 2013