Corrigendum: Lower serum insulin-like growth factor 2 level in patients with bipolar disorder is associated with the severity of manic symptoms during manic episodes - Ye, Shi-Yi; Zhao, Ying; Liu, Zhao-Bo; Luo, Cui-Pin; Xiong, Jian-Wen; Zhan, Jin-Qiong; Li, Yi-Heng; Wei, Bo; Chen, Chun-Nuan; Yang, Yuan-Jian (Frontiers in Psychiatry, 2024)