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Corresponding Author
Department of Medical Imaging Center, Gansu Provincial Maternity and Child-care Hospital, Lanzhou, Gansu Province, P. R. China
Correspondence
Li-guo Yao, Department of Medical Imaging Center, Gansu Provincial Maternity and Child-care Hospital, Lanzhou, Gansu Province 730050, P. R. China.
Email: yaopqzx@126.com
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