1. University of Michigan Medical School Ann Arbor MI USA
2. 17th Department of Plastic Surgery Plastic Surgery Hospital Chinese Academy of Medical Sciences Peking Union Medical College Beijing China
3. Department of Hand Surgery Jishuitan Hospital Beijing China
4. Department of Rheumatology and Immunology Peking University People's Hospital Beijing China
5. Survey Research Center Ann Arbor MI USA
6. Survey Methodology Program Institute for Social Research Ann Arbor MI USA
7. Section of Plastic Surgery University of Michigan Ann Arbor MI USA