@article{201904.0176,
	doi = {10.20944/preprints201904.0176.v1},
	url = {https://doi.org/10.20944/preprints201904.0176.v1},
	year = 2019,
	month = {April},
	publisher = {Preprints},
	author = {Hussein Al-Hakeim and Suhaer Al-Fadhel and Arafat Hussein Al-Dujaili and Michael Maes},
	title = {In Major Depression, Increased Serum Dynorphin and Kappa Opioid Receptor Levels are Positively Associated with Mu Opioid Receptor Levels and Immune Activation and Are Attenuated by Nicotine Dependence},
	journal = {Preprints}
}