1. University of Kentucky Program for Bioethics, Medical Science Building, MS-581, University of Kentucky, Lexington, KY 40536, USA
2. Department of Internal Medicine & Thyroid Cancer Research Laboratory, University of Kentucky Thyroid Oncology Program, VA Medical Center, Lexington, KY 40536, USA
3. University of Chicago Department of Surgery & MacLean Center for Clinical Medical Ethics, 5841 S Maryland Ave, MC 4052, Chicago, IL 60637, USA
4. Institute of Gerontology, The University of Tokyo, Faculty of Engineering Bldg 8, #713 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-8656, Japan
5. Sau Po Centre on Ageing, The University of Hong Kong 2/F, The Hong Kong Jockey Club Building for Interdisciplinary Research, 5 Sassoon Road, Pokfulam, Hong Kong
6. Department of Clinical Pharmacology, Tokai University School of Medicine, Isehara, Kanagawa, 259-1193, Japan