1 Western University, Schulich School of Medicine & Dentistry, Department of Anesthesiology & Perioperative Medicine, London, Canada; BC Women's Hospital and Health Centre, Department of Anesthesia, Vancouver, Canada.
2 McMaster University, Faculty of Health Sciences, Department of Medicine, Hamilton, Canada.
3 Western University, Schulich School of Medicine & Dentistry, Department of Anesthesiology & Perioperative Medicine, London, Canada.
4 Western University, Schulich School of Medicine & Dentistry, Department of Anesthesiology & Perioperative Medicine, London, Canada; BC Women's Hospital and Health Centre, Department of Anesthesia, Vancouver, Canada. Electronic address: [email protected].