Associations of secondary spontaneous pneumothorax characteristics with key clinical outcomes – a prospective cohort study - Eleanor C. Barton; Fiona C. Warren; Sirui Zheng; Jenny Symonds; Emma Tucker; Karl Jackson; Catharine Pearce; Megan Fahy; Poh Chai Tan; Wafa Hassan; Kay Por Yip; Beenish Iqbal; et al. (ERJ Open Research, 2026)