21. Bendstrup E, Vasakova M. Immunodeficiency. In: Wuyts WA, Cottin V, Spagnolo P, et al. Pulmonary Manifestations of Systemic Diseases (ERS Monograph). Sheffield, European Respiratory Society, 2019 pp. 374–390. 22. Borie R, Kannengiesser C, Crestani B. Telomere syndrome. In: Wuyts WA, Cottin V, Spagnolo P, et al. Pulmonary Manifestations of Systemic Diseases (ERS Monograph). Sheffield, European Respiratory Society, 2019 pp. 391–403. 23. Yserbyt J, Wells AU. Sarcoidosis: pulmonary manifestations and management. In: Wuyts WA, Cottin V, Spagnolo P, et al. Pulmonary Manifestations of Systemic Diseases (ERS Monograph). Sheffield, European Respiratory Society, 2019 pp. 404–418. Disclosures: W.A. Wuyts reports receiving the following outside the submitted work: grants from Roche and Boehringer Ingelheim paid to his institution. P. Spagnolo reports receiving the following outside the submitted work: personal fees and non-financial support from Roche Boehringer Ingelheim, Zambon, Galapagos, Chiesi and Red-X Pharma and grants, personal fees and non-financial support from PPM Services. P. Spagnolo’s wife is employed by Novartis. A.U. Wells reports receiving the following, outside the submitted work: consultancy and speaking fees from Roche and Boehringer Ingelheim and consultancy fees from Bayer and Blade. xii https://doi.org/10.1183/2312508X.10033219