1Department of Dermatology, Columbia University Medical Center, New York, New York, USA.
2Department of Genetics, Washington University School of Medicine, St. Louis, Missouri, USA.
3Institut de Recerca Sant Joan de Déu; Institut de Biomedicina de la Universitat de Barcelona; and Dept. Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, Spain.
4Hospital del Mar Medical Research Institute; Dermatology Service, Hospital del Mar, Barcelona, Spain.
5Hospital del Mar Medical Research Institute; Laboratory of Molecular Cytogenetics, Pathology Service, Hospital del Mar, Barcelona, Spain.
6Pierian Diagnostics, St. Louis, Missouri, USA.
7Department of Dermatology, Yale School of Medicine, New Haven, Connecticut, USA.
8Department of Dermatology, Leiden University Medical Center, Leiden, the Netherlands.
9Department of Dermatology, Columbia University Medical Center, New York, New York, USA. Electronic address: ljg2145@cumc.columbia.edu.