1. Division of Dermatology, Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA
2. Center for the Study of Itch and Sensory Disorders, Washington University School of Medicine, St. Louis, MO, USA
3. Department of Dermatology, College of Medicine, Korea University, Seoul, Korea
4. Department of Dermatology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
5. Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO, USA
6. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA