[1] Charite Univ Med Berlin, Ctr Musculoskeletal Surg, Berlin, Germany
[2] Paracelsus Med Univ, Inst Tendon & Bone Regenerat, Salzburg, Austria
[3] Charite Univ Med Berlin, Julius Wolff Inst Biomech & Musculoskeletal Regen, Berlin, Germany
[4] Schulthess Clin, Dept Shoulder & Elbow Surg, Zurich, Switzerland