University Hospital Cologne, Cologne, Germany
Center of Ophthalmology, University of Cologne, Cologne, NRW, Germany
University hospital of Cologne, Department of Neonatology, Cologne, Germany
University Hospital of Cologne, Cologne, NRW, Germany
University of Cologne, Cologne, NRW, Germany
Department of Anaesthesiology and Critical Care Medicine, University Hospital of Cologne, Cologne, Germany
University Hospital of Cologne, Cologne, Germany
Hospital Universitario Clinico San Carlos, Madrid, Spain
Dipartimento di Scienze Biomediche, Sperimentali e Cliniche Mario Serio, Firenze, Italy
University of Cologne, Cologne, Germany
University hospital, Department of orthopedics & traumasurgery, Cologne, NRW, Germany
University hospital, Department of orthopedics, Halle, Sachsen-Anhalt, Germany
Departement of General Neurosurgery of th University of Cologne, Cologne, Germany