Background
In December 2019, a series of mystical pneumonia cases appeared and soon followed by an outbreak in Wuhan China, with clinical manifestations similar to those of viral pneumonia 1. It was soon discovered that this virus outbreak was due to a novel coronavirus which is now named as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) 2. At present, this novel coronavirus caused disease (COVID-19) has spread throughout China and is rapidly sweeping through countries all over the world 3-5. Human-to-human transmission of this virus is clearly proven6,7. The clinical presentation of COVID-19 pneumonia can be very diversified, and in severe cases it could present as acute respiratory distress syndrome (ARDS) that is often followed by death8-11.