Risk of progression and survival in multiple myeloma relapsing after therapy with IMiDs and bortezomib: a multicenter international myeloma working group study

S K Kumar, J H Lee, J J Lahuerta, G Morgan, P G Richardson, J Crowley, J Haessler, J Feather, A Hoering, P Moreau, X LeLeu, C Hulin, S K Klein, P Sonneveld, D Siegel, J Bladé, H Goldschmidt, S Jagannath, J S Miguel, R OrlowskiA Palumbo, O Sezer, S V Rajkumar, B G M Durie, IMWG, Keith Wheatley