Erratum for: Elucidation of the Intestinal Absorption Mechanism of Celastrol Using the Caco-2 Cell Transwell Model - Li, Hong; Li, Jie; Liu, Lu; Zhang, Yichuan; Luo, Yili; Zhang, Xiaoli; Yang, Peng; Zhang, Manna; Yu, Weifeng; Qu, Shen (Planta Medica, 2016)