http://dx.doi.org/10.1016/j.pmip.2016.11.003 2468-1717/ 2016 Elsevier Inc. All rights reserved. Abbreviations: BD, bipolar disorder; CSF, cerebrospinal fluid; BDNF, brain-derived neurotrophic factor; NT3, neurotrophin-3; NT4, neurotrophin-4; NGF, nerve factor; Trk, tyrosine kinase receptor; p75, TNF receptor superfamily member 1B; CNS, central nervous system; MDD, major depressive disorder; DLP...