1. Department of Mechanical Engineering, Chosun University, Gwangju501-759, Republic of Korea
2. Institute of Veterinary Physiology, University of Zürich, Zürich8057, Switzerland
3. Center for Clinical Studies (ZKS), Vetsuisse Faculty, University of Zürich, Zürich8006, Switzerland
4. Scientific Center for Optical and Electron Microscopy, ETH Zürich, Zürich8093, Switzerland
5. Department of Biology, Institute of Biochemistry, ETH Zürich, Zürich8093, Switzerland