1. Otolaryngology Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Barcelona, Spain
2. International Working Group on Endoscopic Ear Surgery (IWGEES)
3. Otology Research Group of Young Otolaryngologists of The International Federations of Otorhinolaryngological Societies (YO-IFOS), Paris, France
4. Son Espases University Hospital, University of the Balearic Islands, Spain