Retraction notice to "Leonurine (SCM-198) attenuates myocardial fibrotic response via inhibition of NADPH oxidase 4" [Free Radical Biol. Med. 54 (2013) 93-104]. - Liu, Xin-Hua; Pan, Li-Long; Deng, Hai-Yan; Xiong, Qing-Hui; Wu, Dan; Huang, Guo-Ying; Gong, Qi-Hai; Zhu, Yi-Zhun (Free Radical Biology & Medicine, 2026)