1. Department of Neurosurgery Keck School of Medicine of the University of Southern California Los Angeles California U.S.A.
2. Department of Pathology Keck School of Medicine of the University of Southern California Los Angeles California U.S.A.
3. Department of Pulmonary and Critical Care Keck School of Medicine of the University of Southern California Los Angeles California U.S.A.
4. Department of Otolaryngology Keck School of Medicine of the University of Southern California Los Angeles California U.S.A.