Ning WEI, Bo-chao HUANG, Shao-jia LU, Jian-bo HU, Xiao-yi ZHOU, Chan-chan HU, Jing-kai CHEN, Jin-wen HUANG, Shu-guang LI, Zheng WANG, Dan-dan WANG, Yi XU, and Shao-hua HU declare that they have no conflict of interest.
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 (5). Informed consent was obtained from all patients for being included in the study.