1. Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig Maximilian University, Munich, Germany.
2. Department of Biology, Skeletal Research Center, Case Western Reserve University, Cleveland, Ohio.
3. Institute of Medical Engineering, Technical University of Munich, Munich, Germany.
4. Department of Pediatric Otolaryngology, Head and Neck Surgery, Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, Ohio.