Iqbal, S., Alanazi, R., Alahmed, A., Alnakhli, A., Alghanim, M., Alghamdi, M., & Ahmad, S. (1969). Prevalence of sleep disturbance and anxiety due to the COVID-19 pandemic in Saudi Arabia. Sleep Science (Sao Paulo, Brazil), 14(Spec 1), 56-62. https://doi.org/10.5935/1984-0063.20200079 (Original work published 1969)