T cells subsets (CD4⁺/CD8⁺) and T-cell activation markers (HLA-DR⁺, CD69⁺, CD25⁺, CD45RA⁺, CD45RA⁻, CD62L⁻) in peripheral blood mononuclear cells for surveys 1 and 2.

(1) n = 33 patients and 27 controls from both surveys. (2) n = 16 patients and 14 controls from survey 2. (3) n = 17 patients and 13 controls from survey 1. Data are expressed in percentages of total lymphocyte events acquired with the FACSCalibur (104 on average)±standard deviation. *Significant difference between controls and patients (P<0.05).