[1] Expt Hematol Unit, Milan, Italy
[2] Div Immunol, Milan, Italy
[3] Transplantat & Infect Dis, Milan, Italy
[4] IRCCS Osped San Raffaele, Milan, Italy
[5] Dept Obstet & Gynecol, Cambridge, MA USA
[6] IRCCS Osped San Raffaele, San Raffaele, MA USA
[7] Dept Obstet & Gynecol, Cambridge, Italy