“…We published a protocol with a detailed description of the methodology before conducting the review 4. We searched the main bibliographic databases (CENTRAL, MEDLINE, Embase and Web of Science Core Collection) from 1975 to October 2018 for published RCTs, and clinical trial registers (ClinicalTrials.gov, International Clinical Trials Registry Platform (ICTRP), International Standard Randomised Controlled Trial Number (ISRCTN)) for ongoing RCTs.…”