1,550
Participants
Start Date
August 1, 2022
Primary Completion Date
December 30, 2026
Study Completion Date
December 31, 2027
smoking
Smoking history and spirometry are used to define groups
RECRUITING
China-Japan Friendship Hospital, Beijing
RECRUITING
Affiliated Hospital of Zunyi Medical University, Zunyi
Chinese Academy of Medical Sciences
OTHER
Ting YANG
OTHER