1. Anesthesia Associates of Ann Arbor; Ann Arbor MI USA
2. Wayne State University; Detroit MI USA
3. Department of Anesthesia; University of Cincinnati; Cincinnati OH USA
4. Department of Anesthesia, Critical Care & Pain Medicine; Massachusetts General Hospital; Harvard Medical School; Boston MA USA
5. Department of Anesthesia; Massachusetts Eye and Ear Infirmary; Boston MA USA
6. Department of Anesthesia; Stanford University; Palo Alto CA USA
7. Agha Khan University; Karachi Pakistan
8. Departments of Anesthesiology, Critical Care Medicine, Pediatrics, and Neurosurgery; The Johns Hopkins University; Baltimore MD USA