Provider: Impact Journals, LLC TY - JOUR AU - Hu, Kaiyuan AU - Lin, Liu AU - Liang, Ying AU - Shao, Xinning AU - Hu, Zhongwei AU - Luo, Hongbin AU - Lei, Ming TI - COVID-19: risk factors for severe cases of the Delta variant JO - Aging JA - Aging (Albany NY) VL - 13 IS - 20 PB - Impact Journals, LLC SN - 1945-4589 UR - https://doi.org/10.18632/aging.203655 DO - 10.18632/aging.203655 SP - 23459 EP - 23470 PY - ER -