BDNF and Anxiety: Comparing the serum BDNF, NT-3, and 5-HT levels in patients with different degrees of anxiety (\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{upgreek}\usepackage{mathrsfs}\setlength{\oddsidemargin}{-69pt}\begin{document}$\overline{x}$\end{document}x ̄± s).