Fig. 1. (A) Participants received botulinum toxin type A injections at 8 different points that were 1 cm apart in a 2×5 cm region located 5 cm below the lower edge of the acromion. (B) The circumference of the upper arm was measured using a measuring tape at a point 2.5 cm below the acromion between the anterolateral point (AP) and posterolateral point (PP).