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Supplement 1. Survey for checking for the recurrence of BPPV
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1. [Check for recurrence] After the treatment, have you ever felt dizzy again while lying
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down, waking up, or turning over in bed similar to when you were diagnosed with BPPV?
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Answer: Yes, I have. → move to Q2-1, 2-2, 2-3
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No, I have not → move to Q3
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2-1. When did you feel dizzy? (Ask the exact or approximate date.)
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2-2. How did you feel the dizziness? Was the dizziness like turning around when you were
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diagnosed with BPPV or another type, like just a little bit dizzy? (Ask whether the
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dizziness was true vertigo or not.)
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2-3. Did you go to another hospital when you felt dizzy? Did you receive treatment at
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another hospital?
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(Ask which hospital the patient went to, whether BPPV was diagnosed, and what kind
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of treatment the patient received.)
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3. [Encouraging revisit on relapse] If you feel dizzy again later, please come directly to our
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outpatient clinic or emergency room. We will treat you right away. If you feel dizzy
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currently, we can make an outpatient appointment for you.
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