Received: 12 March 2020
Accepted: 13 August 2020
First Online: 18 August 2020
Ethics approval and consent to participate
: All the ethics approval has been given by the ethics committee of Beijing shijitan hospital affiliated to capital medical university and have been performed in accordance with the Declaration of Helsinki. We used the participants data by anonymous. All involved study populations were from the previous physical examination group and part of the population are not in Beijing. All the participants received the informed consent by email. We read informed consent to patients or their immediate family members by telephone and inform them of the purpose and significance of the study, and obtain their oral consent, which is approved by the ethics committee.
: Not applicable.
: The authors declare that they have no competing interests in this section.