Duan X, Lu L, Wang Y, et al. Int J Nanomedicine. 2017;12:6705–6719. The authors have advised that Figures 6, 8 and 9 on pages 6713, 6715 and 6716, respectively, of the published paper are incorrect. The errors were introduced by the Editorial staff during the publication process. The correct figures are shown in Download Article. Read the original article