Yu, Ling-jia
Li, Wen-jing
Guo, Shi-gong
Zhao, Yu
Article History
First Online: 7 June 2018
Compliance with ethical guidelines
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: L. Yu, W. Li, S. Guo and Y. Zhao declare that they have no competing interests.
: This study was approved by the institutional review board of Peking Union Medical College Hospital (no. S‑K364). The methods were carried out in accordance with the relevant guidelines. Written informed consent was obtained from all participants in the study at final follow-up at the clinic.