1. Department of Dermatology, Mayo Clinic, Rochester, MN 55905, USA
2. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA
3. Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA
4. Department of Medicine, Division of General Internal Medicine, Mayo Clinic, Rochester, MN 55905, USA