Jack A Kastelik1, Faiza Chowdhury2, Anthony Arnold2. 1. Department of Respiratory Medicine, Castle Hill Hospital, East Yorkshire NHS Trust, University of Hull and Hull York Medical School, East Yorkshire, England. Electronic address: jack.kastelik@hey.nhs.uk. 2. Department of Respiratory Medicine, Castle Hill Hospital, East Yorkshire NHS Trust, University of Hull and Hull York Medical School, East Yorkshire, England.