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Figure S1. Selection procedure for the patients.

Figure S2. The inclinometric single-link pendulum device for assessing postural sway consists of a belt fastened firmly to a subject at the level of the sacrum, an inflexible measuring rod, an inclinometric module and a joint structure lying on the ground connected with a power unit and a computer. The movement of the measuring rod (Dx,y) is calculated separately in lateral (x) and antero–posterior (y) directions at the level of the estimated height (h) of the center of gravity, α being the measured inclination.

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