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The individual region plots are approximately scaled to reflect number of participants in each region (actual numbers: Northeast n = 145; Midwest n = 477; South n = 782; West n = 184; Canada n = 72; Australia n = 19; France n = 130; Germany n = 158; Italy n = 56; England excluded because of small number [n = 3]; p < 0.0001). BoNT = botulinum toxin.
