1. The Photonic Systems Group, Dept. Electrical and Computer Engineering, McGill University, McConnell Engineering Building, Montréal H3A 0E9, Canada
2. Department of Biomedical Engineering, McGill University, Duff Medical Building, Montréal H3A 2B4, Canada
3. Faculty of Dentistry, McGill University, Strathcona Anatomy & Dentistry Building, Montréal H3A 0C7, Canada