1. Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, Leiden, The Netherlands;
2. Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands;
3. Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands; and
4. Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-University of California, Los Angeles Medical Center, Torrance, California