Frank, T. L., Frank, P. I., Cropper, J. A., Hazell, M. L., Hannaford, P. C., McNamee, R. R., . . . Pickering, C. A. (2003). Identification of adults with symptoms suggestive of obstructive airways disease: Validation of a postal respiratory questionnaire. BioMed Central.

Frank, Timothy L., Peter I. Frank, Jennifer A. Cropper, Michelle L. Hazell, Philip C. Hannaford, Roseanne R. McNamee, Sybil Hirsch, and Charles AC Pickering. Identification of Adults With Symptoms Suggestive of Obstructive Airways Disease: Validation of a Postal Respiratory Questionnaire. BioMed Central, 2003.

Frank, Timothy L., et al. Identification of Adults With Symptoms Suggestive of Obstructive Airways Disease: Validation of a Postal Respiratory Questionnaire. BioMed Central, 2003.