BDNF and otitis media with effusion: In the case of the two GLUT1 samples (OME-04 and OME-05), we found similar levels of PDGF in healthy samples (median 2887 pg/mL vs. 2424 pg/mL in healthy samples), but lower levels of EGF (median 130 pg/mL vs. 210 pg/mL in healthy samples), BDNF (median of 48 ng/mL vs. 141 ng/mL in healthy samples), and MIF (median 121 ng/mL vs. 375 ng/mL in healthy samples) in comparison with healthy samples (Figure 5A–D) (Supplementary Tables S1 and S3).