1. Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
2. Scleroderma Program, University of Michigan, Ann Arbor, MI, USA
3. Department of Physical Medicine and Rehabilitation, University of Michigan, Ann Arbor, MI, USA
4. Chronic Pain & Fatigue Research Center, Department of Anesthesiology, University of Michigan, Ann Arbor, MI, USA