An important article from the Straight Times interviewing
Dr Peng Zhiyong, director of acute medicine at the Wuhan University South Central Hospital. Note, the clinical criteria for diagnosis was very restrictive until the 18th of January (requirement for a positive test) before being relaxed, this will have a significant bearing on the data on confirmed cases.
The number of patients in the interview also matches the JAMA publication
Clinical Characteristics of 138 Hospitalized Patients With 2019 Novel Coronavirus–Infected Pneumonia in Wuhan, China which appeared recently.