TY - JOUR A1 - Avlund, K. A1 - Lund, R. A1 - Holstein, B.E. A1 - Due, P. A1 - Sakari-Rantala, R. A1 - Heikkinen, R.L. T1 - The impact of structural and functional characteristics of social relations as determinants of functional decline Y1 - 2004 JF - Journals of Gerontology Series B: Psychological Sciences and Social Sciences VL - 59B IS - 1 SP - S44 EP - -S51 ER -