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老年人群上消化道出血的相关危险因素调查分析
蔡哲锋
Investigation analysis on correlated risk factors of acute upper gastrointestinal bleeding in the elder population
Cai Zhefeng
中国医院统计 . 2016, (5): 342 -344 .  DOI: 10.3969/j.issn.1006-5253.2016.05.007