Neurobiol Aging. 2002 Jan-Feb;23(1):23-6. Comment in: Neurobiol Aging. 2002 Jan-Feb;23(1):27-9. Comment on: Neurobiol Aging. 2002 Jan-Feb;23(1):17-9. What is physiologic complexity and how does it change with aging and disease? Goldberger AL, Peng CK, Lipsitz LA. Cardiovascular Division, Department of Medicine, and Margret and H.A. Rey Laboratory for Nonlinear Dynamics in Medicine, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, USA. agoldber@caregroup.harvard.edu Publication Types: Comment PMID: 11755014 [PubMed - indexed for MEDLINE]