1. National Centre for Infectious Diseases, Singapore
2. Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore
3. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
4. Department of Infectious Diseases, Peking Union Medical College Hospital in Beijing, Beijing, China
5. Division of Infectious Diseases, Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Republic of Korea