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Average percentage of satisfaction levels of (1) safety, (2) GUI, (3) wheelchair speed and (4) the entire system, in both automatic navigation (Auto: High-level navigation, the users select the destination and the system will fully navigate the wheelchair to the desired destination) and shared-control modes (Share: Shared-control navigation, the users select each command by themselves, the navigation system is used only for obstacle avoidance) based on a questionnaire
