“…However, the strength of the results is limited by the quality of the included studies. Only five of the studies were randomised controlled trials (Fenlon et al 2013, Hickman et al 2018, Lombardi et al 2019, Patel et al 2020, Plunkett et al 2017 with several others being retrospective in nature (Blonk et al 2019, Johnson et al 2019, Mahajan et al 2017, Yu 2020. Nearly half of the included studies had small sample sizes of 100 or fewer participants, and some studies had a lack of blinding, both to patients and to staff, which introduces significant potential for bias.…”