1. Department of Dermatology; Fu Xing Hospital of Capital Medical University; Beijing China
2. Department of Obstetrics and Gynecology; Fu Xing Hospital of Capital Medical University; Beijing China
3. Department of Physical Examination; Primary and Middle School Health Care Institute of Xuan wu District; Beijing China
4. Department of Ultrasonography; Fu Xing Hospital of Capital Medical University; Beijing China
5. Department of Dermatology; Xuan Wu Hospital Capital Medical University; Beijing China