Immune Status and Mortality in Smokers, Ex-smokers, and Never-Smokers: The Ludwigshafen Risk and Cardiovascular Health Study. - Delgado GE; Krämer BK; März W; Hellstern P; Kleber ME; Leipe J (Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco, 2021)