1. Tarnow-Mordi, W., Reid, E., Griffiths, P., & Wilkinson, A. Low inspired gas temperature and respiratory complications in infants with a very low birth weight. J. Pediatr. 114, 438–442 (1989).
2. Greenspan, J., Wolfson, M., & Shaffer, T. Airway responsiveness to low inspired gas temperature in preterm neonates. J. Pediatr. 118, 443–445 (1991).
3. Williams, R., Rankin, N., Smith, T., Galler, D., & Seakins, P. Relationship between the humidity and temperature of inspired gas and the function of airway mucosa. Crit. Care Med. 24, 1920–1929 (1996).
4. Branson, R. & Gentile, M. Is humidification always necessary during noninvasive ventilation in the hospital? Respir. Care 55, 209–216 (2010).
5. Reynolds, P. Environmental Humidification: Incubator Humidity for Premature Neonates. http://www.nhsforthvalley.com/__documents/qi/CE_Guideline_WCDNeonatal/HumidificationofInc (2017).
6. ADHB. NW Newborn Clinical Guideline - Humidification. http://www.adhb.govt.nz/newborn/Guidelines/Admission/Humidification.htm.
7. The Royal Children’s Hospital Melbourne. Clinical Guidelines (Nursing): Environmental humidity for premature neonates. https://www.rch.org.au/rchcpg/hospital_clinical_guideline_index/Environmental_humidity_for_premature_neonates/.
8. American Association for Respiratory Care. Clinical Practice Guideline: Bland Aerosol Administration – 2003 Revision and Update. Respir. Care 48, 529–533 (2003).
9. Williams, R. B. The effects of excessive humidity. Respir. Care Clin. N. Am. 4, 215–228 (1998).
10. Estes, R. J. & Meduri, G. U. The pathogenesis of ventilator-associated pneumonia: I. Mechanisms of bacterial transcolonization and airway inoculation. Intensive Care Medicine vol. 21 365–383 (1995).
11. Hamill, R. et al. An outbreak of Burkholderia (formerly Pseudomonas) cepacia respiratory tract colonization and infection associated with nebulized albuterol therapy. Ann. Intern. Med. 122, 762–766 (1995).
12. Avery’s Diseases of the Newborn. (W. B. Saunders, 2012).
13. Lindemann, J., Leiacker, R., Rettinger, G., & Keck, T. Nasal mucosal temperature during respiration. Clin. Otolaryngol. Allied Sci. 27, 135–139 (2002).
14. Keck, T., Leiacker, R., Riechelmann, H., & Rettinger, G. Temperature profile in the nasal cavity. Laryngoscope 110, 651–654 (2000).
15. Mercke, U. The influence of temperature on mucociliary activity. Temperature range 40 degrees C to 50 degrees C. Acta Otolaryngol. 78, 253–258.
16. Gotera, C., Díaz Lobato, S., Pinto, T., & Winck, J. C. Clinical evidence on high-flow oxygen therapy and active humidification in adults. Rev. Port. Pneumol. 19, 217–227 (2013).
17. Bustamante-Marin, X. M. & Ostrowski, L. E. Cilia and mucociliary clearance. Cold Spring Harb. Perspect. Biol. 9, (2017).
18. Primiano, F. J. et al. Water vapor and temperature dynamics in the upper airways of normal and CF subjects. Eur. Respir. J. 1, 407–414 (1988).
19. World Health Organization & Maternal and Newborn Health/Safe Motherhood. Thermal control of the newborn: a practical guide. (1993).
20. Pollett, H. F. & Reid, W. D. Prevention of obstruction of nasopharyngeal CPAP tubes by adequate humidification of inspired gases. Can. Anaesth. Soc. J. 24, 615–617 (1977).
21. Tuggey, J. M., Delmastro, M., & Elliott, M. W. The effect of mouth leak and humidification during nasal non-invasive ventilation. Respir. Med. 101, 1874–1879 (2007).
22. Massie, C. A., Hart, R. W., Peralez, K., & Richards, G. N. Effects of humidification on nasal symptoms and compliance in sleep apnea patients using continuous positive airway pressure. Chest 116, 403–408 (1999).
23. Wiest, G. H. et al. A heated humidifier reduces upper airway dryness during continuous positive airway pressure therapy. Respir. Med. 93, 21–26 (1999).
24. De Boeck, K., Vermeulen, F., Vreys, M., Moens, M., & Proesmans, M. Airway clearance techniques to treat acute respiratory disorders in previously healthy children: Where is the evidence? Eur. J. Pediatr. 167, 607–612 (2008).
25. Fink, J. B. Forced expiratory technique, directed cough, and autogenic drainage. Respir. Care 52, 1210–1221 (2007).
26. Hess, D. R. The evidence for secretion clearance techniques. Respir. Care 46, 1276–1293 (2001).
27. Volsko, T. A. Airway clearance therapy: Finding the evidence. Respir. Care 58, 1669–1678 (2013).
28. Morrow, B. M. Airway clearance therapy in acute paediatric respiratory illness: A state-of-the-art review. South African J. Physiother. 75, (2019).
29. Plotnikow, G. A., Accoce, M., Navarro, E., & Tiribelli, N. Humidification and heating of inhaled gas in patients with artificial airway. A narrative review. Rev. Bras. Ter. Intensiva 30, 86–97 (2018).