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[AUDITORY] Looking for demographics for middle ear hearing loss



I'm exploring a new bone conduction device to support people with “mechanical” hearing loss due to middle ear issues. I have been trying to find numbers for how many people that may be affected but so far I have found no data. 
Are there any demographics published about this subgroup of hearing impaired?
Secondarily, of that number. How many have surgical intervention?

Best regards
Mikael Fernström