Randomized Phase III Trial of Consolidation Therapy with Bortezomib (Velcade) - Lenalidomide (Revlimid) - Dexamethasone (VRD) versus Bortezomib (Velcade) - Dexamethasone (VD) for Patients with Multiple Myeloma Who Have Completed a Dexamethasone Based Induction Regimen