1. Department of Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada.
2. Department of Anesthesia, Pain Management, and Perioperative Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
3. Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.
4. Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada.
5. Department of Ophthalmology, Dalhousie University, Halifax, Nova Scotia, Canada.
6. Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada.