1. Buck Institute for Research on Aging, Novato, CA 94952, USA
2. Drug Discovery Research, Astellas Pharma, Tsukuba, Ibaraki, Japan
3. Department of Pediatrics, McMaster University, Ontario, Canada
4. Exerkine Corporation, Hamilton, Canada
5. Department of Nutritional Sciences and Toxicology, University of California, Berkeley, CA 94720, USA