Liu, Yang
Wen, Hongyan
Article History
First Online: 19 February 2018
Compliance with ethical guidelines
:
: Y. Liu and H.-y. Wen declare that they have no competing interests.
: Informed consent was obtained from all patients. The experimental protocol was approved by the Medical Ethics Committee of the Second Hospital of Shanxi Medical University and complied with the Declaration of Helsinki (approval number: 2013ky007).