Searching for a study

I read in one of my books about a study done on the elderly switching care givers or not having the same care giver can be bad for lack of a better word. But for some reason I can not find it. I can ask my Professor tomorrow but it is driving me crazy since I can't find it. Anyone know where?
http://www.ncea.aoa.gov/Resources/Pu.../caregiver.pdfWhen caregivers continue to change, it can set off a red flag......

Quote from siddymaeI read in one of my books about a study done on the elderly switching care givers or not having the same care giver can be bad for lack of a better word. But for some reason I can not find it. I can ask my Professor tomorrow but it is driving me crazy since I can't find it. Anyone know where?