중고령자 1인가구 삶의 만족도 변화 및 영향 요인 분석: 중고령자 다인가구와 비교 분석 = Analysis of Changes in Life Satisfaction and Influence Factors in Single-Person Households of Middle-Aged and Elderly People: Comparative Analysis of Middle-Aged and Elderly People with Multi-Person Households
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