“…58,64,70,72,74-76,79,93,104.109,110,115,124,139,163,164,166,176, 190-195 The trials varied in their duration, the populations studied and the regimens used (see appendix 5). Of these trials, 18 were either stated to be open-label or there was no implication that they were blinded, for instance, by reference to the use of placebos, 64,72,[74][75][76]79,93,104,109,110,115,124,139,164,176,190,191,193,194 although in six of them the outcome assessors had been blinded to treatment status. 64,124,164,190,191,193 For further details of their methodological quality, see appendix 5.…”