The effect of the tumour necrosis factor-alpha-inhibitor etanercept on microglial activation patients with mild cognitive impairment—a PET study oleh Alexander Gerhard, Richard Sharples, Tsepo Goerttler, Kathryn McDonald, Eszter Visi, Rainer Hinz, Federico Turkheimer, Isabel Lewzey, Karl Herholz, Andreas H. Jacobs, Clive Holmes