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Study on the relation between the presence of a yolk sac and β-hCG level in ectopic pregnancy |
XUE Qin1, ZOU Da-zhong1, ZHANG Zhi-min2, XU Yu-fang1, TAN Jie1 |
1. Jiangyin People’s Hospital Affiliated of South-East University, Jiangyin Jiangsu 214400, China;2. Zhongda Hospital Affiliated of South-East University, Nanjing 210009, China |
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