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The Caregiver Questionnaire Form included; 1) basic demographic data of the patient and caregiver, 2) lifestyle and family history, 3) past medical history including vascular risk factors such as hypertension, diabetes, heart disease, hyperlipidemia, previous stroke history, alcohol, and smoking. Vascular risk factors were regarded as positive either if the patient had previously been diagnosed with associated disease or if he or she was currently under medical treatment for the disease. Smoking history was considered to be positive for both past and current smokers. However, current smokers were only included in statistical analysis. The Caregiver Questionnaire Form also included; 4) Korean Dementia Screening Questionnaire.