pro re nata dosing group  n = 57 scheduled dosing group  n = 56 Age median (months) 66 88 Range 24- 166 35-184 Weight  median (kg) 24 25 range Oct-45 Dec-64 Height  median (cm) 120 124 range 87-156 87-171 Gender (Male/Female) 23/34 27/29 Number of muscles operated (one/two) 39/18 17/39 Data are presented as median and range, or number of cases (n=113)

Table 1: Patient demographics and surgical data of the two study groups.