- 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 11 April 2013
- Revised 9 January 2014
- Accepted 13 January 2014
- Published online 18 March 2014.
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