Retraction Notice to: Silencing of Long Non-coding RNA HOTTIP Reduces Inflammation in Rheumatoid Arthritis by Demethylation of SFRP1 - Xumin Hu; Jianhua Tang; Xuyun Hu; Peng Bao; Weixi Deng; Jionglin Wu; Yuwei Liang; Zhipeng Chen; Liangbin Gao; Yong Tang (Elsevier, 2022)