[1] DARTMOUTH COLL, HITCHCOCK MED CTR, DEPT COMMUNITY & FAMILY MED, HANOVER, NH 03756 USA
[2] UNIV CALIF LOS ANGELES, DEPT MED, DIV GERIATR MED, LOS ANGELES, CA 90024 USA
[3] RAND CORP, SANTA MONICA, CA 90406 USA
[4] HOSP CORP AMER, NASHVILLE, TN USA