Cui Yulong, Xu Junmei, Dai Ruping, and He Liang. 2012. “The Interface Between Inhibition of Descending Noradrenergic Pain Control Pathways and Negative Affects in Post-Traumatic Pain Patients”. Upsala Journal of Medical Sciences 117 (3). https://doi.org/10.3109/03009734.2011.653606.