1. Guangzhou Institute of Dermatology Guangzhou China
2. Department of Epidemiology and Biostatistics College for Public Health & Social Justice Saint Louis University St Louis MO USA
3. Department of Epidemiology and BiostatisticsCollege of Public HealthZhengzhou University Zhengzhou Henan China
4. Department of Behavioral Science and Health Education College for Public Health & Social Justice Saint Louis University St Louis MO USA
5. Department of Epidemiology School of Public Health Sun Yat‐sen University Guangzhou China