RecruitingPhase 2Drug trialAlloNK®, an Allogeneic Non-genetically Modified, Cord Blood-derived NK Cell Therapy, in Combination With Rituximab, Studied in Relapsing Forms of B-cell Dependent Rheumatologic Diseases.A Basket Trial of Refractory Rheumatoid Arthritis (RA), Sjögren's Disease (SjD), Idiopathic Inflammatory Myopathies (IIMs) and Systemic Sclerosis (SSc) subjects to evaluate the safety and efficacy of AlloNK, a non-genetically modified allogeneic NK cell, in combination with rituximab.