International Differences in the Frequency of Chronic Obstructive Pulmonary Disease Exacerbations Reported in Three Clinical Trials.
Calverley PMA, Martinez FJ, Vestbo J, Jenkins CR, Wise R, Lipson DA, Cowans NJ, Yates J, Crim C, Celli BR. International Differences in the Frequency of Chronic Obstructive Pulmonary Disease Exacerbations Reported in Three Clinical Trials. Am J Respir Crit Care Med. 2022 07 01; 206(1):25-33.