“…Most ( n = 15) studies included 1 intervention and 1 control group [13–20, 22, 24, 29–33], 1 study had 3 parallel arms [28], and five studies had no control group [21, 23, 25, 26, 34]. Four studies were carried out in China [13, 31–33], 3 each in Japan [23, 26, 30] and the United Kingdom [16–18], 2 each in Italy [27, 28] and Germany [19, 22], and 1 each in the United States [14], Austria [20], Sweden [25], Greece [29], Romania [24], and Korea [21]. One study was a multisite RCT carried out in Belgium, France, Germany, Italy, the Netherlands, and Spain [15].…”