[1] MEYERS PRIMARY CARE INST, WORCESTER, MA 01608 USA
[2] BRIGHAM & WOMENS HOSP, DEPT MED, BOSTON, MA 02115 USA
[3] HARVARD UNIV, SCH MED, BOSTON, MA USA
[4] FALLON HEALTHCARE SYST, WORCESTER, MA USA
[5] UNIV MASSACHUSETTS, MED CTR, WORCESTER, MA USA
[6] UNIV TORONTO, TORONTO, ON, CANADA
[7] BAYCREST CTR GERIAT CARE, TORONTO, ON, CANADA