Eleven of the nineteen studies included in this systematic review had a randomized, double-blind placebo-controlled study design [9,17,18,21,22,23,29,30,31,32,33], one study had a single-center open-label comparative study design [24], one study had a prospective design [26], one study had a prospective single-center parallel-group design [28], one study had a prospective randomized study design [27], one study had a prospective randomized placebo-controlled study design [25], one study had an interventional casecontrol study design [35], one study was a prospective analysis [36], and one study had a matched group design [34]
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