Reply to: Estrogens for protection from an index and recurrent episodes of takotsubo syndrome?. Issue 3 (12th August 2021) - Fu, Lu; Zhang, Hongyuan; Machuki, Jeremiah Ong'achwa; Zhang, Tingting; Han, Lin; Sang, Lili; Wu, Lijuan; Zhao, Zhiwei; Turley, Matthew James; Hu, Xide; Hou, Hongjian; Li, Dongye; et al.