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Central gain control in tinnitus and hyperacusis
For observational studies (cohort and case-control), the NewcastleOttawa Scale (NOS) ( Risk of bias was interpreted as follows: i) Low risk: All criteria met or no more than one rated as unclear
Initially, Safe B12 injection dosage for adults is usually administered 1-3 times per week
As levels continue to drop, symptoms become more noticeable
Cost : B complex injections may be more expensive than oral supplements due to the cost of the injection itself and the cost of the healthcare provider's time and expertise
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