{"nct_id":"NCT00757939","title":"A Study to Assess Regional Cerebral Blood Flow as an Alzheimer's Disease Biomarker Compared to Positron Emission Tomography in Patients With Mild-to-Moderate Alzheimer's Disease and Cognitively Normal Elderly Subjects (Study MK-0000-068)(COMPLETED)","status":"COMPLETED","status_verified_date":"2015-08","start_date":"2008-09","start_date_type":null,"primary_completion_date":"2010-10","primary_completion_date_type":"ACTUAL","completion_date":"2010-10","completion_date_type":"ACTUAL","phases":["PHASE1"],"tickers":["MRK"]}