Hearing Loss, Conductive

• Alazhar university Hopital in Assiut — Asyut, Asyut Governorate, Egypt

• Department of USF Health Otolaryngology; Auditory Rehabilitation & Clinical Trials Lab — Tampa, Florida, United States

• Royal National Ear, Nose and Throat and Eastman Dental Hospitals — London, United Kingdom
• Nottingham Auditory Implant Programme — Nottingham, United Kingdom
• Sheffield Teaching Hospitals — Sheffield, United Kingdom

• UZ Leuven — Leuven, Belgium

• The University of California, San Francisco — San Francisco, California, United States

• Wake Forest University Health Sciences — Winston-Salem, North Carolina, United States

• Audioptics Medical — Halifax, Nova Scotia, Canada

• Chalmers — Gothenburg, Sweden

Not specified

• Department of otolaryngology — Khon Kaen, Thailand