Author contributions
cough
All persons who meet authorship criteria are listed as authors, and all authors certify that they have participated sufficiently in the work to take public responsibility for the content, including participation in the concept, design, analysis, writing, or revision of the manuscript. RN: Developing the technique, design of trial, capturing data, document preparation and submission. CP: Photography, image analysis, statistical analysis, document review. AL: Photography, data capture, image analysis, statistical analysis, document review. PR: Developing the technique, design of trial, capturing data, document review. MC: Development of the cough model and document review. AA: Imaging, image analysis, statistical analysis, document review.