There is a deficiency in guidelines about the treatment of autoimmune hemolytic anemia in systemic lupus erythematosus (SLE), especially in refractory cases. Mycophenolate mofetil (MMF) showed promising results in those patients but still, the data available are in form of case reports. So, the investigators will investigate the efficiency of MMF against a well-established treatment Rituximab in the treatment of refractory autoimmune hemolytic anemia in SLE patients.