1 Steinberg-Bernstein Centre for Minimally Invasive Surgery and Innovation, McGill University Health Centre, Montreal, Canada.
2 Department of Epidemiology, Biostatistics and Occupational Health, McGill University Health Centre, Montreal, Canada.
3 Department of Anesthesia, McGill University Health Centre, Montreal, Canada.
4 Steinberg-Bernstein Centre for Minimally Invasive Surgery and Innovation, McGill University Health Centre, Montreal, Canada. Electronic address: liane.feldman@mcgill.ca.