1. The School of Nursing Sun Yat‐Sen University Guangzhou China
2. Department of Geriatrics Guangdong General Hospital, Institute of Geriatrics, Guangdong Academy of Medical Sciences Guangzhou China
3. Department of Infectious Disease Guangdong Provincial Engineering Research Center of Molecular Imaging, Guangdong Provincial Key Laboratory of Biomedical Imaging, The Fifth Affiliated Hospital, Sun Yat‐sen University Zhuhai China