Retraction Note: Reducing PKCδ inhibits tumor growth through growth hormone by inhibiting PKA/CREB/ERK signaling pathway in pituitary adenoma - Xi Chen; Jianyao Mao; Liwei Zhou; Weichao Jiang; Zhangyu Li; Yukui Li; Sifang Chen; Guowei Tan; Yuanyuan Xie; Chen Wang; Jinli Sun (Scientific Reports)