1 AESCULAP AG Research & Development, Tuttlingen, Germany; Department of Orthopaedic Surgery, Physical Medicine & Rehabilitation, Ludwig Maximilians University Munich, Campus Grosshadern, Munich, Germany.
2 AESCULAP AG Research & Development, Tuttlingen, Germany.
3 Campbell Clinic Department of Orthopaedic Surgery & Biomedical Engineering, University of Tennessee Health Science Center, TN, USA.