Li Y, Zhu C, Zhang B, Liu L, Ji F, Zhao Y, Cheng J, Shao H, Guan X, Ming F, Wu C, Du ZX (2021) Nutritional status is closely related to the severity of COVID-19: a multi-center retrospective study. J Infect Dev Ctries 15:490–500. doi: 10.3855/jidc.14178