Comparing the Impact of Robotic Rollator Control Schemes on Elderly Gait using on-line LRF-based Gait Analysis G. Chalvatzaki, X. S. Papageorgiou, P. Maragos, C. S. Tzafestas A Workshop on Mobile Robot Assistants for the Elderly (MoRobAE) in 2019 IEEE International Conference on Robotics and Automation (ICRA), Montreal, Canada.