Delayed noradrenergic activation in the dorsal hippocampus promotes the long-term persistence of extinguished fear - Ning Chai; Jian-Feng Liu; Yan-Xue Xue; Chang Yang; Wei Yan; Hui-Min Wang; Yi-xiao Luo; Hai-Shui Shi; Ji-Shi Wang; Yan-Ping Bao; Shi-Qiu Meng; Zeng-bo Ding; et al. (Neuropsychopharmacology, 2014)