Fig. 1From: Walking stability in patients with benign paroxysmal positional vertigo: an objective assessment using wearable accelerometers and machine learningTwo accelerometers at the back of head and the third lumbar spinous process(L3), where the X-axis pointed to the right representing the mediolateral (ML) axis, the Y-axis pointed forwards representing the anteroposterior (AP) axis, and the Z-axis pointed to the upwards representing the vertical (VT) axisBack to article page