1. Medical Scientist Training Program, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
2. Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, Tennessee, USA
3. School of Medicine, Vanderbilt University, Nashville, Tennessee, USA
4. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
5. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA