Randomized Controlled Trial Assessing Vitamin D's Role in Reducing BPPV Recurrence in Older Adults.

Objective: To determine if the recurrence rates of BPPV in older adults were lower in the vitamin D-treated group as compared to placebo groups.

Study Design: Double-blinded randomized control placebo trial.

Setting: A single-centre study.

Lexicon for classifying ear-canal shapes.

The ear canal is usually described as an S-shaped funnel. In attempting to classify ear-canal shapes obtained from point clouds digitized from molds of 300 ears, the problem of designing criteria for distinguishing and organizing the canal shapes arose. In this work, we extracted features inspired by the S-shape characteristic (critical point, maximum, minimum, twist, writhe, translation, rotation) and, through them, introduced 14 types of ear-canal shapes.