“…The total observation period ranged from one to six months. Eight studies tested CoQ10 in an FM [ 35 , 36 , 37 , 39 , 42 , 44 , 45 , 46 ], eight in an SM study design [ 38 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ], and one did not clearly report the design [ 43 ]. Only three studies applied a placebo [ 45 , 48 , 49 ], and all other studies were controlled against SRP alone.…”