inclusion criteria: * the participants were diagnosed as covid-19 pneumonia, according to the notice on printing and distributing the diagnosis and treatment plan of pneumonia with new coronavirus infection (trial version 4 or update version) made by national health commission of the people's republic of china. * written the informed consent

inclusion criteria: * the participants were diagnosed as covid-19 pneumonia, according to the notice on printing and distributing the diagnosis and treatment plan of pneumonia with new coronavirus infection (trial version 4 or update version) made by national health commission of the people's republic of china. * written the informed consent

inclusion criteria: - the participants were diagnosed as covid-19 pneumonia, according to the notice on printing and distributing the diagnosis and treatment plan of pneumonia with new coronavirus infection (trial version 4 or update version) made by national health commission of the people's republic of china. - written the informed consent

inclusion criteria: - the participants were diagnosed as covid-19 pneumonia, according to the notice on printing and distributing the diagnosis and treatment plan of pneumonia with new coronavirus infection (trial version 4 or update version) made by national health commission of the people's republic of china. - written the informed consent