Bronchiolitis Obliterans/immunology; CD4-Positive T-Lymphocytes/metabolism; CD8-Positive T-Lymphocytes/metabolism; Graft Rejection/blood; Lung Transplantation/immunology; Receptors, CCR4; Adult; Biomarkers/blood; Bronchiolitis Obliterans/blood; Bronchiolitis Obliterans/etiology; Bronchiolitis Obliterans/pathology; CD4-Positive T-Lymphocytes/immunology; CD8-Positive T-Lymphocytes/immunology; Case-Control Studies; Cell Movement/immunology; Cells, Cultured; Chemokine CCL17/biosynthesis; Chemokine CCL17/immunology; Chemokine CCL2/biosynthesis; Chemokine CCL2/immunology; Chemokine CCL22/biosynthesis; Chemokine CCL22/immunology; Female; Flow Cytometry; Graft Rejection/immunology; Graft Rejection/pathology; Humans; Lung Transplantation/adverse effects; Lung Transplantation/pathology; Male; Middle Aged; Receptors, CCR4/biosynthesis; Receptors, CCR4/blood; Receptors, CCR4/immunology; Syndrome; T-Lymphocyte Subsets/immunology; T-Lymphocyte Subsets/metabolism; Time Factors