Evaluation of immune system in patients with transfusion‐dependent beta‐thalassemia in Rasoul‐e‐Akram Hospital in 2021: A descriptive cross‐sectional study oleh Fahime Ehsanipour, Pooya Faranoush, Mohammad Reza Foroughi‐Gilvaee, Negin Sadighnia, Morteza Fallahpour, Mona Motamedi, Afsoon Zandi, Zahra Safaei, Ashkan Zandi, Mohammad Faranoush