Population Risk Factors for Severe Disease and Mortality in COVID-19 in the United States during the Pre-Vaccine Era: A Retrospective Cohort Study of National Inpatient Sample oleh Kavin Raj, Karthik Yeruva, Keerthana Jyotheeswara Pillai, Preetham Kumar, Ankit Agrawal, Sanya Chandna, Akhilesh Khuttan, Shalini Tripathi, Ramya Akella, Thulasi Ram Gudi, Abi Watts, Christian C Toquica Gahona, Umesh Bhagat, Surya Kiran Aedma, Ayesha Tamkinat Jalal, Shyam Ganti, Padmini Varadarajan, Ramdas G Pai