The efficacy and safety of coronary sinus reducer in refractory angina: a systematic review and meta-analysis by Ahmed Elshahat, Muhammad Ashraf Husain, Ahmed Elbataa, Ahmed Farid Gadelmawla, Hamdy A. Makhlouf, Rahma AbdElfattah Ibrahim, Mohammed Sabri Hassanin, Fayed Mohamed Rzk, Ahmed Elmorsy Mohamed, Ahmed Helmi, Moaz Abouelmagd, Ahmed O. Sena, Ahmed Bahnasy, Emad Singer, Ahmed Almahdy Mohamed, Mohamed Yasser Elnaggar, Shereen Mohamed Olama, Mahmoud G. A. Saleh, Esraa A. Shaban, Ahmed Abdelaziz

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