1. Meek PM . Measurement of dyspnea in chronic obstructive pulmonary disease: what is the tool telling you . Chronic Resp Dis2004; 1: 29–37 .
2.
2. Guyatt GH , Feeny DH , Patrick DL . Measuring health related quality of life . Ann Intern Med1993; 118: 622–629 .
3.
3. Mahler D , Guyatt G , Jones P . Clinical measurement of dyspnoea. In Mahler D ed. Lung biology in health and disease: dyspnea, vol. 111. New York: Marcel Decker , 1998: 149–198.
4.
4. Jones PW , Wilson R . Cognitive aspects of breathlessness. In Lewis A , Guz P eds, Lung biology in health and disease: respiratory sensation, vol. 90. New York: Marcel Dekker , 1996: 314-314.
