Measurements included balance assessment , specifically the ratio of medial-lateral ( ML ) center-of-gravity ( COG ) sway to anterior-posterior ( AP ) sway ( COGML/AP ) and ankle/hip sway during eyes-open , eyes-closed , and eyes-open dual-task trials , the Unified Parkinson 's Disease Rating Scale ( UPDRS ) , as well as quality of life , concerns for fall , and pain questionnaires .