Development and validation of risk prediction models for COVID-19 positivity in a hospital setting oleh Ming-Yen Ng, Eric Yuk Fai Wan, Ho Yuen Frank Wong, Siu Ting Leung, Jonan Chun Yin Lee, Thomas Wing-Yan Chin, Christine Shing Yen Lo, Macy Mei-Sze Lui, Edward Hung Tat Chan, Ambrose Ho-Tung Fong, Sau Yung Fung, On Hang Ching, Keith Wan-Hang Chiu, Tom Wai Hin Chung, Varut Vardhanbhuti, Hiu Yin Sonia Lam, Kelvin Kai Wang To, Jeffrey Long Fung Chiu, Tina Poy Wing Lam, Pek Lan Khong, Raymond Wai To Liu, Johnny Wai Man Chan, Alan Ka Lun Wu, Kwok-Cheung Lung, Ivan Fan Ngai Hung, Chak Sing Lau, Michael D. Kuo, Mary Sau-Man Ip