aNephrology Unit, Department of Health Sciences, Università degli Studi di Milano, Italy

bTranslational Transplant Research Center (TTRC), Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA

Correspondence to Paolo Cravedi, MD, PhD, Icahn School of Medicine at Mount Sinai, 1 Levy Place, New York, NY 10029, USA. Tel: +1 212 241 3349; fax: +1 212 987 0389; e-mail: [email protected]