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Article History

Received: 7 April 2015

Accepted: 19 July 2015

First Online: 8 October 2015

Compliance with ethical standards

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: S hi-Shu Zhu, Qing-Lei Zeng, Yi Dong, Zhi-Qiang Xu, Li-Min Wang, Da-Wei Chen, Yu Gan, Fu-Chuan Wang, Jian-Guo Yan, Li-Li Cao, Pu Wang, Jin Han, Xue-Xiu Zhang, Zheng Zhang, Hong-Fei Zhang, and Fu-Sheng Wang declare that they have no conflict of interest. The authors who have taken part in this study do not have a relationship with the manufacturers of the drugs involved in either the past or present, and they did not receive funding from the manufacturers to perform this research.

: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008. Informed consent was obtained from all patients’ parents for being included in the study. The Beijing 302 Hospital Ethics Committee approved the study, and all involved patients gave written informed consent for their clinical data and samples (blood, serum) to be used in this study. Human experimentation guidelines of China were followed in the conduct of this research.

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