“…Data from a total of 706 participants (ranging from 29 to 246, only 3 studies [34,38,40] enrolled $100 individuals) were extracted of whom 98 received SE alone and 203 received SE combined with other therapies (151 combined with back school, 12 combined with magnetic field warmer vibration synthetic therapy, 20 combined with intermediate frequency electrotherapy, 10 combined with acupuncture therapy). 46% of the participants included in 8 trials [34,[36][37][38][39][40][41][42] were men, and sex was not reported for one trial [35]. The mean age of study patients ranged from 20.30 to 49.94 years.…”