Ultradian rhythmicity of plasma cortisol is necessary for normal emotional and cognitive responses in man - Kalafatakis, K; Russell, GM; Harmer, CJ; Munafo, MR; Marchant, N; Wilson, A; Brooks, JC; Durant, D; Thakrar, J; Murphy, P; Thai, NJ; Lightman, SL (Proceedings of the National Academy of Sciences, 2018)