1. Biomedical Engineering, Department of Electrical Engineering/JJ X-Ray A/S Scion-DTU, Technical University of Denmark, 2800 Kongens Lyngby, Denmark. E-mails: rasal@elektro.dtu.dk, remel.salmingo@frontier.hokudai.ac.jp
2. Department of Orthopaedic Surgery, Hvidovre University Hospital, Kettegaards Allé 30, 2650 Hvidovre, Denmark. E-mails: tlskytte@gmail.com, chwo123@gmail.com
3. Biomedical Engineering, Department of Electrical Engineering, Technical University of Denmark, Ørsteds Plads, 2800 Kongens Lyngby, Denmark. E-mails: mse@elektro.dtu.dk, kah@elektro.dtu.dk
4. Department of Wind Energy, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark. E-mail: lapm@dtu.dk