A barrier to entry is a high cost or other type of barrier that prevents a business startup from entering a market and competing with other businesses. Barriers to entry can include government regulations, the need for licenses, and having to compete with a large corporation as a small business startup.

1 Does central vertigo decrease with time?

2 Are vestibular sedatives such as betahistine indicated in the treatment of benign paroxysmal positional vertigo?

3 Does the absence of nystagmus in Hallpike's manoeuvre exclude benign paroxysmal positional vertigo (BPPV), even in the presence of a typical clinical picture and an absence of other possibilities? Does wearing Frenzel's goggles increase sensitivity?

4 With Mnire's disease, what steps should be taken: 1. In acute attacks? 2. Before an attack starts?

5 I want to ask about the proven medicine for tinnitus in UK.

6 Why do patients with Goldenhar's syndrome experience speech delay, despite the fact that they might be able to use their unaffected ear to listen with?

7 In sinusitis, it is not the nasal cavity that is congested by excessive mucus but the openings between the paranasal sinuses and nasal cavity. Why, therefore, does sinusitis cause difficulty breathing?

8 What is the modern treatment and prognosis for glaucoma.

9 What is the recommended treatment for slow age-related macular degeneration of the eye?

10 What does the term pseudo-papilloedema mean?