Clinical, Immunological and Histopathological Characteristics of Anti-Interferon-Gamma Autoantibody-Associated Immunodeficiency ─ Implications on Novel Diagnostic and Therapeutic Approaches (Extended Study) (II) = 抗丙型干擾素自體抗體引致免疫缺陷之臨床、免疫學及病理學特性 ─ 新穎診斷及治療方法探討(延伸研究) (II)