*Department of Dermatology, Feinberg School of Medicine, Northwestern University

§§§Department of Medicine, Section of Dermatology, University of Chicago, Chicago, IL

†Department of Pathology, Western General Hospital, Edinburgh, UK

‡Department of Pathology, Yale School of Medicine, New Haven, CT

§Department of Pathology, Dermatopathology Service, Memorial Sloan Kettering Cancer Center, New York City, NY

∥Department of Biopathology, Centre Leon Bernard, Lyon

****Department of Translational Research, Curie Institute, Paris Sciences & Letters University, and UFR of Medicine, University of Paris Cité, Paris, France

¶Department of Dermatopathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA

#Department of Pathology and Laboratory Medicine, Division of Anatomic Pathology, Hospital of the University of Pennsylvania, Philadelphia, PA

**Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH

††Department of Pathology, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil

‡‡Department of Pathology, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil

§§Department of Dermatology and Pathology, University of Michigan Medical School, Ann Arbor, MI

∥∥Department of Health Sciences, Section of Anatomic Pathology, University of Florence, Florence, Italy

¶¶Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland

##Departments of Pathology and Dermatology, Emory University School of Medicine, Atlanta, GA

***Department of Tissue Pathology, Royal Prince Alfred Hospital, and NSW Health Pathology, North Sydney, NSW, Australia

†††Department of Dermatopathology, The University of Sydney, Sydney, NSW, Australia

‡‡‡Melanoma Institute Australia, North Sydney, NSW, Australia

∥∥∥Department of Anatomic and Clinical Pathology, Tufts Medical School, Boston, MA

¶¶¶Department of Dermatology, Chonnam National University Medical School, Gwangju, Korea

###Department of Pathology, Division Laboratories, Pharmacy and Biomedical Genetics University Medical Center Utrecht, The Netherlands

This work was supported by the IDP Foundation.

Conflicts of Interest and Source of Funding: P.G. has served as a consultant for Castle Biosciences and has received royalties for textbooks from Elsevier. For the remaining authors, none were declared.

Correspondence: Pedram Gerami, MD, Department of Dermatology, Northwestern University, 676 N. St. Clair Street, Suite 1765, Chicago, IL 60611 (e-mail: [email protected]).