Beijing Chao-Yang Hospital;
Capital Medical University;
WHO Collaborating Center for Tobacco or Health;
Beijing 100020;
China;
Beijing Institute of Respiratory Medicine;
Beij'ing 100020;
China;
Department of Respiratory;
Capital Medical University;
Beijing 100069;
China;
Guangzhou Institute of Respiratory Disease;
1st Affiliated Hospital;
Guangzhou Medical College;
Guangzhou 520120;
China;
Zhongshan Hospital;
Fudan University;
Shanghai 200032;
China;
Changzheng Hospital;
2nd Military Medical University;
Shanghai 200003;
China;
1st Affiliated Hospital;
Sun Yat-sen University;
Guangzhou 510080;
China;
people's Hospital;
Peking University;
Beijing 100044;
China;
Shanghai Johnson & Johnson Pharmaceuticals;
Shanghai 200245;
China;
McNeil AB;
Helsingborg;
Sweden;
Johnson & Johnson;
New Jersey;
USA;
Research Centre of Respiratory Medicine in Beijing Hospital;
Ministry of Health of the People 1's Republic of China;
Beijing 100730;
China;