Fig. 2
From: The smell of lung disease: a review of the current status of electronic nose technology
Radar plot of development stages per eNose and disease. Studies were divided into five different stages: (1) proof of concept study; (2) cohort size of diseased participants less than fifty; (3) cohort size of diseased participants equal or more than fifty; (4) study cohort with an external validation cohort; (5) evaluation of clinical implementation. The highest stage reached for each eNose per lung disease is displayed. eNose prototypes are not included. BIONOTE  biosensor-based multisensorial system for mimicking nose tongue and eyes, CF  cystic fibrosis, COPD  chronic obstructive pulmonary disease, ILD  interstitial lung disease, OSA  obstructive sleep apnoea, PEN  portable electronic nose.