1. Department of Dermatology, Northwest Hospital The Second Affiliated Hospital of Xi'an Jiaotong University Xi'an China
2. Department of Dermatology, The Second Affiliated Hospital of Baotou Medical College Inner Mongolia University of Science and Technology Baotou China
3. Research Center of Clinical Epidemiology, The First Affiliated Hospital of Baotou Medical College Inner Mongolia University of Science and Technology Baotou China
4. Department of Dermatology Bayannur Hospital Bayannur China
5. Department of Dermatology, The First Affiliated Hospital of Baotou Medical College Inner Mongolia University of Science and Technology Baotou China
6. School of Public Health, Baotou Medical College Inner Mongolia University of Science and Technology Baotou China