One out of every ten U.S. citizens is hard of hearing to some degree, doctors estimate. At least 4,000,000 have a disability severe enough to call for medical attention. But 3,000,000 of these do not seek it, prefer to go on cocking their heads, cupping their hands behind their ears and trying to lipread. Even those who go to a doctor are not assured of the best help; across the U.S. there are few speech-and-hearing centers where a patient can be rigorously examined for correctable causes of deafness (e.g., emotional factors or unsuspected...
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