Jiang, Yu
Guo, Yuan
Zhu, Zhenghua
Wang, Yukun
Article History
First Online: 18 October 2019
Compliance with ethical guidelines
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: Y. Jiang, Y. Guo, Z. Zhu and Y. Wang declare that they have no competing interests.
: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. For images or other information within the manuscript which identify patients, consent was obtained from them and/or their legal guardians.