Erratum to: PDK1-mTOR signaling pathway inhibitors reduce cell proliferation in MK2206 resistant neuroblastoma cells. Issue 1 (December 2015) - Qi, Lei; Toyoda, Hidemi; Xu, Dong-qing; Zhou, Ye; Sakurai, Naoto; Amano, Keishirou; Kihira, Kentaro; Hori, Hiroki; Azuma, Eiichi; Komada, Yoshihiro