Methodological steps used by authors of systematic reviews and meta-analyses of clinical trials: a cross-sectional study oleh Hoang Thi Nam Giang, Ali Mahmoud Ahmed, Reem Yousry Fala, Mohamed Magdy Khattab, Mona Hassan Ahmed Othman, Sara Attia Mahmoud Abdelrahman, Le Phuong Thao, Ahmed Elsaid Abd Elsamie Gabl, Samar Ahmed Elrashedy, Peter N. Lee, Kenji Hirayama, Hosni Salem, Nguyen Tien Huy