“…27,33 Only one study asked for consent before randomisation. 25 Four studies reported using a cluster randomisation, 26,28,33,35 but only two accounted for it in the analysis. 26,28 Although 6 studies adopted algorithms in the randomisation that forced people from the same household or at the same address to be allocated to the same arm, 23,24,27,30,33,36 none of them accounted for it in the analysis (the effect on variance of this clustering is usually irrelevant, as usually only one subject per household and rarely two are eligible).…”