Received: 3 December 2020
Accepted: 26 April 2021
First Online: 3 May 2021
Ethics approval and consent to participate
: All methods of this study were carried out in accordance with relevant guidelines and regulation. The study was part of LAM registry study of Peking Union Medical College Hospital. The protocol of this study was approved by the Ethical Committee of Peking Union Medical College Hospital (S-k1244). All subjects included in this study signed informed consent documents.
: Consent for publication was obtained from all participants.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.