Randomized Controlled Trial

Nocturnal oxygenation using a pulsed-dose oxygen-conserving device compared to continuous flow.

Resp Care. 2006 Mar 1;51(3):252-6.
Review

Long-term continuous oxygen treatment in chronic obstructive pulmonary disease: proper use, benefits and unresolved issues.

Curr Opin Pulm Med. 2007 Mar 1;13(2):120-4.
Clinical Trial

Long-term oxygen therapy in chronic obstructive pulmonary disease: the use of concentrators and liquid oxygen systems in north-western Greece.

Respiration. 2006 Jan 1; 73 (6): 777-82.