[1] Dalhousie Univ, Fac Med, Halifax, NS, Canada
[2] Dalhousie Univ, Dept Anesthesia Pain Management & Perioperat Med, Halifax, NS, Canada
[3] IWK Hlth Ctr, 5850-5920 Univ Ave,POB 9700, Halifax, NS B3K 6R8, Canada
[4] Dalhousie Univ, Dept Surg, Div Plast & Reconstruct Surg, Halifax, NS, Canada
[5] Dalhousie Univ, Dept Surg, Div Otolaryngol Head & Neck Surg, Halifax, NS, Canada