Singer, Tania Department Social Neuroscience, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5521249/ (Any fulltext)
Zaki, J., Wager, T. D., Singer, T., Keysers, C., & Gazzola, V. (2016). The anatomy of suffering: Understanding the relationship between nociceptive and empathic pain. Trends in Cognitive Sciences, 20(4), 249-259. doi:10.1016/j.tics.2016.02.003.