"10.1378/chest.07-1131" . . "PMC7094310" . . . "no-cc" . . "2015-12-28"^^ . "18252918" . . "18252918" . "PMC" . "Chest" . . "Tan, Wan" . "COPD in Asia: Where East Meets West" . . "Ng, Tze" . .