1 Keck School of Medicine of USC Department of Dermatology, University of Southern California, Los Angeles, California, USA. Electronic address: armstrongpublication@gmail.com.
2 School of Medicine, University of Puerto Rico, San Juan, Puerto Rico, USA.
3 School of Medicine, University of California Riverside, Riverside, California, USA.
4 UCSF Department of Dermatology, University of California San Francisco, San Francisco, California, USA.
5 National Psoriasis Foundation, Portland, Oregon, USA.