1. a Department of Applied Social Sciences , The Hong Kong Polytechnic University , Hung Hom , Kolwoon Hong Kong , China
2. b United Christian Hospital , Hong Kong , China
3. c Department of Psychiatry , The Chinese University of Hong Kong , Hong Kong , China
4. d Division of Endocrinology, Gerontology & Metabolism , Stanford University School of Medicine , 251 Campus Dr #Msob341, Stanford , CA 94305 , USA
5. e Department of Psychiatry and Behavioral Sciences , Stanford University School of Medicine , Gero Psychiatry Clinic 401 Quarry RD MC: 5717, Stanford , CA 94305 , USA