*Department of Dermatology, Mayo Clinic, Rochester, MN;

†Mayo Clinic Children's Center, Mayo Clinic, Rochester, MN; and

‡Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.

Correspondence: Emma F. Johnson, MD, 200 First Street SW, Rochester, MN 55905 (e-mail: [email protected]).

The authors have no conflicts of interest to declare.