“…Eleven of the studies were multicentre RCTs [15,21,25,29,31,32,34,39,41,44,45] . Duration of bismuth therapy ranged from 7 to 56 d, with a total daily dose of between 400 mg and 2100 mg. Nineteen studies used ranitidine bismuth citrate [15,17,20,22,24,[28][29][30][31][32]34,36,[39][40][41]43,45,46,48] , ten studies colloidal bismuth subcitrate [7,16,18,21,26,27,37,38,42,44] , two studies tripotassium dictrato bismuthate [23,35] , two studies bismuth subsalicylate [25,33] , one study bismuth subnitrate [19] , and one study both bismuth subnitrate and www.wjgnet.com…”