Treatment of Lenalidomide Exposed or Refractory Multiple Myeloma: Network Meta-Analysis of Lenalidomide-Sparing Regimens oleh Cirino Botta, Enrica Antonia Martino, Concetta Conticello, Francesco Mendicino, Ernesto Vigna, Alessandra Romano, Giuseppe Antonio Palumbo, Claudio Cerchione, Giovanni Martinelli, Fortunato Morabito, Francesco Di Raimondo, Massimo Gentile