1. Biomedical Physics Laboratory, School of Physics, Seoul National University; Department of Veterinary Surgery, College of Veterinary Medicine, Seoul National University, Seoul, Korea
2. Biomedical Physics Laboratory, School of Physics, Seoul National University, Seoul, Korea
3. Department of Veterinary Surgery, College of Veterinary Medicine, Seoul National University, Seoul, Korea
4. Research Unit of Biomedical Engineering in Anesthesia and Intensive Care Medicine, Medical University of Graz, Austria