title: Asthma and chronic obstructive pulmonary disease overlap syndrome: An update.
authors.affiliation: Department of Respiratory Medicine, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Lu
authors.affiliation: Department of Respiratory Medicine, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Wan-Zhen
authors.initials: WZ
authors.lastname: Yao