“…Only 6 of these 21 studies had a sample size of n ≥ 10 for both components (PPs and BM-MSCs) (Ben Azouna et al, 2012;Jenhani et al, 2011;Lucarelli et al, 2003;Moisley et al, 2019;Verrier et al, 2010;Yin et al, 2016); with the remaining having a small sample size of n ≤ 6 for one or both components. Discrepancy in sample size between PPs and BM-MSCs within the same study was also observed (Amable et al, 2014;Ben Azouna et al, 2012;Bernardi et al, 2017;Bernardi et al, 2013;Goedecke et al, 2011;Gottipamula et al, 2012;Infante et al, 2017;Jenhani et al, 2011;Kasten et al, 2008;Parsons et al, 2008;Perut et al, 2013;Prins et al, 2009;Vogel et al, 2006;Yin et al, 2016) (Table 2a,b and 3a,b).…”