Serum quantitative determination of BDNF was performed by ELISA using the Human Free BDNF Quantikine ELISA Kit (R&D Systems, Minneapolis, MN, USA), according to the manufacturer’s instructions. The detection range was 62.5–4000 pg/mL, and the sensitivity was 20 pg/mL. Serum insulin-like growth factor binding protein-2 (IGFBP-2) concentration was determined by ELISA. The measurement of all other analytes reported here was described in previous papers [17 (link),18 (link)].
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