1. Department of Dermatology, George Washington University, Washington D.C., USA;
2. Department of Dermatology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA, USA;
3. Department of Dermatology, University of Southern California, Los Angeles, CA, USA;
4. National Psoriasis Foundation, Portland, OR, USA;
5. Department of Dermatology, Eastern Virginia Medical School, Norfolk, VA, USA