1. Department of Physiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
2. Experiment Teaching Center, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
3. Department of Cardiac Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
4. Department of Geratology and Department of Radiology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China