Global longitudinal strain for detection of cardiac iron overload in patients with thalassemia: a meta-analysis of observational studies with individual-level participant data oleh Armin Attar, Alireza Hosseinpour, Hamidreza Hosseinpour, Nahid Rezaeian, Firoozeh Abtahi, Fereshte Mehdizadeh, Mozhgan Parsaee, Nehzat Akiash, Mohaddeseh Behjati, Antonella Meloni, Alessia Pepe