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Journal of Clinical Epidemiology|February 11, 1999
Comparing participants and nonparticipants in a smoking cessation trial: selection factors associated with general practitioner recruitment activityC Senore, R N Battista, A Ponti, et al.Lancet (London, England)|December 12, 1992
Effect of negative pressure ventilation in severe chronic obstructive pulmonary diseaseS H Shapiro, P Ernst, K Gray-Donald, et al.Journal of Clinical Epidemiology|January 1, 1991
A randomized clinical trial of negative pressure ventilation in severe chronic obstructive pulmonary disease: design and methodsS H Shapiro, P T Macklem, K Gray-Donald, et al.Pageof 5