PT - JOURNAL ARTICLE AU - Panayotes Demakakos TI - Importance of population-based longitudinal studies to understanding the impact of COVID-19 AID - 10.1136/jech-2021-217114 DP - 2021 Sep 01 TA - Journal of Epidemiology and Community Health PG - 815--816 VI - 75 IP - 9 4099 - http://jech.bmj.com/content/75/9/815.short 4100 - http://jech.bmj.com/content/75/9/815.full SO - J Epidemiol Community Health2021 Sep 01; 75