Dysregulated Methylation Patterns in Exon IV of the Brain-Derived Neurotrophic Factor (BDNF) Gene in Nicotine Dependence and Changes in BDNF Plasma Levels During Smoking Cessation oleh Kerim Abdelkhalek, Mathias Rhein, Maximilian Deest, Vanessa Buchholz, Stefan Bleich, Ralf Lichtinghagen, Benjamin Vyssoki, Helge Frieling, Marc Muschler, Phileas Johannes Proskynitopoulos, Alexander Glahn