Hou WK, Lee TM, Liang L, Li TW, Liu H, Ettman CK, Galea S. Civil unrest, COVID-19 stressors, anxiety, and depression in the acute phase of the pandemic: a population-based study in Hong Kong. Soc Psychiatry Psychiatr Epidemiol. 2021 Feb 16:1–10. doi: 10.1007/s00127-021-02037-5. Epub ahead of print. PMID: 33590313; PMCID: PMC7884208.