title: Endobronchial ultrasound-guided transbronchial needle aspiration: a maturing technique.
authors.affiliation: China Medical University, Shenyang 110001, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: China Medical University, Shenyang 110001, China.
authors.forename: Yangang
authors.initials: Y
authors.lastname: Ren