Heart Center University of Cologne, Cologne, Germany
University Eye Hospital Freiburg, Freiburg, Germany
Department of Ophthalmology, University of Cologne, Cologne, Germany
1st Department of Medicine, Cologne University Hospital, Cologne, Germany
Uniklinik Köln, Köln, NRW, Germany
University Hospital of Cologne, Cologne, NRW, Germany
University of Texas Health Science Center at Houston, Houston, Texas, United States
University of Miami, Miami, Florida, United States
South Texas Veterans Healthcare System, San Antonio, Texas, United States
Department for Geriatric Medicine - University of Cologne, Cologne, Germany
Department of Pharmacology, Cologne, Northrhine Westphalia, Germany
University Hospital of Cologne; Department of Cardiothoracic Surgery, Cologne, Germany
1st Dept. of Medicine, Cologne University Hospital, Cologne, Germany