1 Mayo Clinic Alix School of Medicine, Scottsdale, AZ.
2 Department of Dermatology, Mayo Clinic, Scottsdale, AZ.
3 Department of Dermatology, Mayo Clinic, Scottsdale, AZ; Department of Laboratory Medicine and Pathology, Mayo Clinic, Scottsdale, AZ. Electronic address: swanson.leah@mayo.edu.