Development and external validation of a mixed-effects deep learning model to diagnose COVID-19 from CT imaging oleh Joshua Bridge, Yanda Meng, Wenyue Zhu, Thomas Fitzmaurice, Thomas Fitzmaurice, Caroline McCann, Cliff Addison, Manhui Wang, Cristin Merritt, Stu Franks, Maria Mackey, Steve Messenger, Renrong Sun, Yitian Zhao, Yalin Zheng