aDivisions of Infectious Diseases

bOrgan Transplantation, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA

Correspondence to Valentina Stosor, MD, Professor, Division of Infectious Diseases, Northwestern University Feinberg School of Medicine, 645 N. Michigan Avenue, Suite 1058, Chicago, IL 60611, USA. Tel: +1 312 503 7612; fax: +1 312 503 7619; e-mail: [email protected]