<qa>  What must caregiver be willing to monitor the patients health and concomitant5. Have reliable caregiver to accompany patient to all study visits. Caregiver must be able to read, understand, and speak local language fluently to ensure comprehension of informed consent and informant-based assessments of patient. Caregiver must also have frequent contact with patient at least 3 hours per week at one time or at different times and be willing to monitor the patients health and concomitant medications throughout the study. 