1. Department of Otolaryngology/Head and Neck Surgery, Hospital de Sant Joan Despí Moisès Broggi de Barcelona, Barcelona, Spain
2. Department of Otolaryngology/Head and Neck Surgery, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
3. Department of Ophthalmology, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
4. Unit of Anatomy and Human Embriology, Universitat Autónoma de Barcelona, Spain