University of Cologne, NICU, Cologne, NRW, Germany
Neonatologische Intensivstation, Cologne, NRW, Germany
Centre of Ophthalmology, University of Cologne, Cologne, NRW, Germany
Medical Clinic for Haematology and Oncology, Cologne, NRW, Germany
Prosper-Hospital, Recklinghausen, Germany
Johannes-Gutenberg-Universität Mainz, Mainz, Germany
Neonatology, Children's Hospital, University of Cologne, Cologne, Germany
Klinikum Stuttgart, Olgahospital, Stuttgart, Germany
DRK Kinderklinik, Siegen, Germany
Ruhr University of Bochum, Children's Hospital St. Josef Spital, Bochum, Germany
1st Dept. of Medicine, Cologne University Hospital, Cologne, Germany
Department of Psychiatry, University of Cologne, Cologne, NRW, Germany