1 University of Nebraska Medical Center, Department of Dermatology; Omaha, NE, USA.
2 University of Nebraska Medical Center, Department of Dermatology; Omaha, NE, USA; University of Utah School of Medicine, Salt Lake City, UT, USA.
3 University of Nebraska Medical Center, Department of Dermatology; Omaha, NE, USA; Rush Medical College, Rush University Medical Center, Chicago, IL, USA.
4 University of Nebraska Medical Center, Department of Dermatology; Omaha, NE, USA. Electronic address: ebarrett@unmc.edu.