17 – Inhalation therapy Inhalation therapy 771 Wytse B. van den Bosch and Hettie M. Janssens 18 – Technology-dependent children Home oxygen therapy, noninvasive and invasive ventilation, 782 and home ventilatory support Brigitte Fauroux, Sonia Khirani and Alessandro Amaddeo Tracheostomy 789 Colin Wallis and Joanne Cooke 19 – Epidemiology and environment Epidemiology of lower respiratory tract infections 797 Hepsi Xavier and Steve Turner Impact of indoor and outdoor pollution on respiratory health 806 Norrice Liu and Jonathan Grigg Prevention and cessation of smoking 815 Giuliana Ferrante, Giovanna Cilluffo and Stefania La Grutta Index 820