Children´s Hospital University of Cologne, Cologne, NRW, Germany
University Hospital, Cologne, Germany
University of Cologne, Cologne, Germany
University of California, Davis, Sacramento, California, United States
Capital Medical Associates PC, Washington, District of Columbia, United States
Univ.-Kklinik fuer Innere Medizin III, Salzberg, Austria
University of Cologne, Cologne, Germany
University of Cologne, Department of Orthopedics& traumasurgery, Cologne, Germany
Urological hospital, Städt. Kliniken Dortmund, Dortmund, Germany
Department of urology, städt. Klinikum Fulda, Fulda, Germany
Heinrich Heine University, Düsseldorf, Germany
University Center of Ophthalmology, Cologne, NRW, Germany
Department of Anaesthesiology and Postoperative Critical Care, Cologne, Germany
Department of Anaesthesiology and Postoperative Critical Care, Cologne, Germany