1. Department of Internal Medicine B-Cardiology, Intensive Care, Pulmonary Medicine and Infectious Diseases
2. Institute for Community Medicine, SHIP/Clinical-Epidemiological Research, University of Greifswald, Greifswald, Germany
3. Respiratory and Critical Care Physiology and Medicine, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute at Harbor-UCLA, Torrance, California, USA