[Li, Hua; Li, Zhiyuan; Li, Changqi; Zhang, Jianyi; Luo, Xuegang] Cent S Univ, Xiangya Sch Med, Dept Anat & Neurobiol, Changsha 410013, Hunan, Peoples R China.
[Li, Hua] Hunan Univ Tradit Chinese Med, Dept Histol & Embryol, Changsha 410208, Hunan, Peoples R China.
[Xu, Junmei; Dai, Ruping; Shi, Xudan] Cent S Univ, Xiangya Hosp 2, Dept Anesthesia, Changsha 410013, Hunan, Peoples R China.
[Zhou, Xinfu] Flinders Univ S Australia, Dept Human Physiol, Adelaide, SA, Australia.