- Correspondence to Dr Lluís Nisa, Department of Otorhinolaryngology—Head & Neck Surgery, Hôpital de Sion—CHCVs/RSV, Avenue du Grand Champsec 80, Sion 1950, Switzerland;
- Received April 11, 2013
- Revised January 9, 2014
- Accepted January 13, 2014
- First published February 10, 2014.
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