1. Department of Psychiatry The Third Affiliated Hospital of Sun Yat‐sen University Guangzhou Guangdong Province 510630 P. R. China
2. Guangdong Mental Health Center Guangdong Provincial People's hospital Guangdong Academy of Medical Sciences Affiliated School of Medicine of South China University of Technology Guangzhou Guangdong Province 510080 P. R. China
3. Department of Psychiatry The Fifth Affiliated Hospital of Sun Yat‐sen University No. 52, East Meihua Road Zhuhai Guangdong Province 519000 P. R. China
4. Guangdong Geriatrics Institute Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou Guangdong Province 510080 P. R. China