Based on the abstract, they did not show anything useful, they produce a null result, this just means that there weren't any effects large enough to be statistically significant for their sample. Weirdly, the still seem to draw a conclusion based on this null result which is really not correct. To draw the conclusion that they did they would have to show that the hypothesis that there is a clinically significant change can be discarded. Which is not mentioned in the abstract that they do.