Does physician communication influence older patients' diabetes self-management and glycemic control? Results from the Health and Retirement Study (HRS). - Heisler M; Cole I; Weir D; Kerr EA; Hayward RA; Heisler, Michele; Cole, Ian; Weir, David; Kerr, Eve A; Hayward, Rodney A (Journals of Gerontology Series A: Biological Sciences & Medical Sciences, 2007)