“…low socioecomic or migrant background or specific ethnicity) [30,35,37,39,41,42,46]. Nine studies reported that their designs were grounded in behavior theory [34,35,39,41,42,45-48]. Only three of the RCTs reported on whether the method of random allocation was concealed [35,44,47] and five on whether the outcome assessor (s) was blinded [31,35,41,44,47].…”