active Senior Examiner for the Royal College of Paediatrics and Child Health (RCPCH) clinical examination) and internationally for the ERS. He is a member of the paediatric HERMES exam committee for the ERS. Alex Cleator Alex Cleator is a senior neonatal subspeciality trainee. He is completing his training in tertiary neonatal intensive care units across Liverpool and Manchester (UK). His interests include neonatal echocardiography, quality improvement and medical education. He is passionate about teaching and sits on the Paediatric Trainee Education Committee in the UK’s North West. He has recently set up a national virtual neonatal teaching programme for senior trainees and also directs the annual 4-day Pre-ST1 course at Alder Hey Children’s Hospital (Liverpool, UK). Alex has found it a privilege to read, review and edit a Monograph of this calibre and is sure it will bring much joy to those who read it. Helen Wallace Helen Wallace is a Senior Lecturer in Physiology (teaching focused), specialising in respiratory physiology education, at the University of Liverpool (Liverpool, UK). She is the Physiology Curriculum Lead, and Research and Scholarship Lead for the Undergraduate Medicine Programme at the University of Liverpool. Her research interests include CF and smooth muscle physiology. viii https://doi.org/10.1183/2312508X.10007021