Just be a bit careful using this as a source of information and read it with the health warning it requires. The study only looked at 18 previous research studies and if you read it you will find there were lots of problems with the studies they reviewed as well as bias in 4 of them. In fact, the conclusion even says:

"Overall, the quality of the evidence was poor, and the data should be interpreted with caution"

Anyone just reading the abstract would have little idea of the limitations because it's not unusual for an abstract in a research paper to be mismatched with the actual conclusions and findings of the study itself.