Are COVID-19 age-mortality curves for 2020 flatter in developing countries? Evidence from a cross-sectional observational study of population-level official death counts and excess deaths estimates

2020年新冠肺炎的年龄死亡率曲线在发展中国家是否更为平缓？一项基于人口层面官方死亡人数和超额死亡人数估计的横断面观察性研究提供的证据