“…6,[27][28][29][30][31] Study design Nine (33%) of the included studies had a controlled design, with six (22%) having random assignment of participants to Skype or to a control, 10,12,13,19,21,25 with the remaining three studies (11%) having non-randomised assignment. 8,22,30 Five studies (19%) reported a pre-test / post-test design, 9,11,16,26,28 while three (11%) reported method-comparison studies.…”