title: [Two cases of bilateral pneumothorax and pneumomediastinum caused by the improper use of the Blue Line Ultra® tracheostomy tube].
authors.affiliation: Department of Otorhinolaryngology, Panyu Central Hospital, Guangzhou 511400, China.
authors.forename: T B
authors.initials: TB
authors.lastname: Hu
authors.affiliation: Otorhinolaryngology Hospital, First Affiliated Hospital of Sun Yat sen University, Guangzhou 510080, China.
authors.forename: W
authors.initials: W
authors.lastname: Sun
authors.affiliation: Otorhinolaryngology Hospital, First Affiliated Hospital of Sun Yat sen University, Guangzhou 510080, China.
authors.forename: W P
authors.initials: WP
authors.lastname: Wen