A clinical and immunological study of children with chronic hepatitis B virus infection - El-Shabrawi, Mortada; Abdelgawad, Manal; Elgaddar, Ola; Hassanin, Fetouh; Khalil, Ahmed; Mahfouz, Aml; Elbanna, Basant (Gastroenterology Review/Przegląd Gastroenterologiczny, 2019)