1. Division of Newborn Medicine, Department of Pediatrics, Tufts University School of Medicine, Boston, MA 02111
2. Laboratory of Viral Pathogenesis, Dana-Farber Cancer Institute, and Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
3. Department of Radiology, Tufts University School of Veterinary Medicine, Grafton, MA 01536, USA.
4. Department of Veterinary Pathology, Tufts University School of Veterinary Medicine, Boston, MA 02111, USA.
5. Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, MA 02114, and Harvard Medical School, Boston, MA 02115, USA.