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Respiratory Medicine|December 17, 2009
Plasma ammonia response to incremental cycling and walking tests in COPDL D Calvert, M C Steiner, M D Morgan, et al.
Thorax|November 20, 2001
Development of a self-reported Chronic Respiratory Questionnaire (CRQ-SR)J E Williams, S J Singh, L Sewell, et al.
The European Respiratory Journal|November 1, 1994
Comparison of oxygen uptake during a conventional treadmill test and the shuttle walking test in chronic airflow limitationS J Singh, M D Morgan, A E Hardman, et al.
The European Respiratory Journal|December 21, 2007
The plasma ammonia response to cycle exercise in COPDL D Calvert, S J Singh, P L Greenhaff, et al.
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