1. McCoy R (2000) Oxygen-conserving techniques and devices. Respir Care 45:95–104
2. Shapiro BA, Harrison RA, Walton JR (1994) Clinical application of blood gases, 3rd edn. Year Book Medical Publishers, Chicago, pp 169–179
3. Kacmarek R (2000) Delivery systems for long-term oxygen therapy. Respir Care 45:84–92
4. ATS Statement: Standards for the Diagnosis and Care of Patients with Chronic Obstructive Pulmonary Disease (1995) Am J Respir Crit Care Med 152(5 Pt 2): S77–S121
5. Bolliger CT, Mathur PN, Beamis JF, et al. (2002) ERS/ATS statement on interventional pulmonology. Eur Respir J 19:356–373