1. Geriatric Research; Education and Clinical Center; Audie L Murphy Division; South Texas Veterans Health Care System; San Antonio TX USA
2. Department of Neurology; Shanghai Jiaotong University Affiliated Sixth People's Hospital; Shanghai China
3. Department of Clinical Oncology; Xijing Hospital; The Fourth Military Medical University; Xi'an China
4. Department of Comprehensive Dentistry; University of Texas Health Science Center at San Antonio; San Antonio TX USA