RT Journal Article SR Electronic T1 A new tracheostomy unit and its evolutional rationale JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 55 OP 60 VO 34 IS 1 A1 Jones, G. O. M. A1 Wasmuth, Carl E. YR 1967 UL http://www.ccjm.org/content/34/1/55.abstract AB