“…28 Eleven of these studies were conducted from 2011 to 2018 and four studies were conducted from 2007 to 2010. 14,17,18,22 Out of the 15 studies, three studies were funded by pharmaceutical companies, 16,20,27 Institute for Health Research, and others, 17,18,21,22,24,28 three studies were not funded, 23,25,26 in two studies (abstracts) it was unclear whether they were funded or not, 14,15 and one study did not disclose funding sources. 19 The relevant healthcare perspective was used in all studies except in one study, which adopted a WHO perspective.…”