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关键词：投资策略,股票市场,标准普尔500指数,Welltower Inc,Mid-America Apartment Communities Inc,American Homes 4 Rent REIT Class A,联邦房地产投资信托,房地产,REITs,金属,医疗保健行业,疗养院,老年人,辅助生活,商业新闻