The efficacy and safety of coronary sinus reducer in refractory angina: a systematic review and meta-analysis. - Elshahat, Ahmed; Husain, Muhammad Ashraf; Elbataa, Ahmed; Gadelmawla, Ahmed Farid; Makhlouf, Hamdy A.; Ibrahim, Rahma AbdElfattah; Hassanin, Mohammed Sabri; Rzk, Fayed Mohamed; Mohamed, Ahmed Elmorsy; Helmi, Ahmed; Abouelmagd, Moaz; Sena, Ahmed O.; et al. (BMC Cardiovascular Disorders, 2025)