1. From the Department of Internal Medicine and Medical Therapy, Section of Internal Medicine and Medical Oncology, IRCCS Policlinico San Matteo and University of Pavia Medical School, Pavia, Italy; the Department of Immunohematology and Blood Transfusion, Istituto Ortopedico Gaetano Pini, Milan, Italy; and the Departments of Laboratory Medicine and Pathology, Children's Hospital and Harvard Medical School, Boston, MA.