Distribution of lower extremity artery disease (LEAD) Fontaine stages over the combined chronic obstructive pulmonary disease (COPD) Global Initiative for Chronic Obstructive Lung Disease (GOLD) groups A/B and C/D (p=0.003). Distribution of lower extremity artery disease (LEAD) Fontaine stages over the combined chronic obstructive pulmonary disease (COPD) Global Initiative for Chronic Obstructive Lung Disease (GOLD) groups A/B and C/D (p=0.003). Carmen Pizarro et al. ERJ Open Res 2016;2:00037-2016 ©2016 by European Respiratory Society