[1] Univ Calif Riverside, Sch Med, Dept Internal Med, Riverside, CA 92521 USA
[2] Riverside Univ Hlth Syst Med Ctr, Dept Internal Med, Moreno Valley, CA USA
[3] Loma Linda Univ, Sch Med, Div Rheumatol, Loma Linda, CA USA
[4] Loma Linda Univ, Sch Med, Dept Med, Loma Linda, CA 92354 USA
[5] Riverside Univ Hlth Syst Med Ctr, Hematol, Moreno Valley, CA USA