1 Department of Biomedical Engineering, Fourth Military Medical University, Xi'an, China; Institute of Technical Medicine, Furtwangen University, VS-Schwenningen, Germany.
2 Department of Anesthesiology and Intensive Care Medicine, University Medical Center of Schleswig-Holstein Campus Kiel, Germany.
3 Department of Internal Medicine, Far Eastern Memorial Hospital, New Taipei City, Taiwan. Electronic address: changmy30@yahoo.com.tw.
4 Institute of Technical Medicine, Furtwangen University, VS-Schwenningen, Germany.