[1]Department of Prosthetic Dentistry, Dental School, University of Cologne, Cologne, Germany;
[2]Center for Biochemistry, Institute for Experimental Dental Research and Oral Musculoskeletal Biology, Medical Faculty, University of Cologne, Cologne, Germany;
[3]Department of Anatomy, University of Cologne, Cologne, Germany;
[4]Department of Molecular and Cellular Sport Medicine, German Sport University, Cologne, Germany;