Fig. 2
From: Comorbidities in unclassifiable interstitial lung disease
Comorbidity clusters and heat maps of each comorbidity. Cluster borders are indicated by the black lines. Each patient is placed in the same area on all maps. Red colors indicate a high frequency of the specific comorbidity, while blue colors indicate absence of the comorbidity. C1: Cluster 1; C2: Cluster 2; C3: Cluster 3; GERD: Gastro-esophageal reflux disease; CAD: Coronary artery disease; VTE: Venous thromboembolism